diff --git a/demo/package-lock.json b/demo/package-lock.json
index 220c417..ed2bb6d 100644
--- a/demo/package-lock.json
+++ b/demo/package-lock.json
@@ -712,15 +712,6 @@
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@@ -737,13 +728,10 @@
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-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
-      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
-      "dev": true,
-      "requires": {
-        "graceful-readlink": "1.0.1"
-      }
+      "version": "2.20.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+      "dev": true
     },
     "commondir": {
       "version": "1.0.1",
@@ -1234,6 +1222,12 @@
         "minimalistic-crypto-utils": "1.0.1"
       }
     },
+    "email-addresses": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/email-addresses/-/email-addresses-3.1.0.tgz",
+      "integrity": "sha512-k0/r7GrWVL32kZlGwfPNgB2Y/mMXVTq/decgLczm/j34whdaspNrZO8CnXPf1laaHxI6ptUlsnAxN+UAPw+fzg==",
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+    },
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@@ -1438,51 +1432,45 @@
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-      "integrity": "sha1-avilAjUNsyRuzEvs9rWjTSL37VM=",
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       "dev": true,
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-        "accepts": "1.3.5",
+        "accepts": "~1.3.5",
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         "body-parser": "1.18.2",
         "content-disposition": "0.5.2",
-        "content-type": "1.0.4",
+        "content-type": "~1.0.4",
         "cookie": "0.3.1",
         "cookie-signature": "1.0.6",
         "debug": "2.6.9",
-        "depd": "1.1.2",
-        "encodeurl": "1.0.2",
-        "escape-html": "1.0.3",
-        "etag": "1.8.1",
+        "depd": "~1.1.2",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
         "finalhandler": "1.1.1",
         "fresh": "0.5.2",
         "merge-descriptors": "1.0.1",
-        "methods": "1.1.2",
-        "on-finished": "2.3.0",
-        "parseurl": "1.3.2",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.2",
         "path-to-regexp": "0.1.7",
-        "proxy-addr": "2.0.3",
+        "proxy-addr": "~2.0.3",
         "qs": "6.5.1",
-        "range-parser": "1.2.0",
+        "range-parser": "~1.2.0",
         "safe-buffer": "5.1.1",
         "send": "0.16.2",
         "serve-static": "1.13.2",
         "setprototypeof": "1.1.0",
-        "statuses": "1.4.0",
-        "type-is": "1.6.16",
+        "statuses": "~1.4.0",
+        "type-is": "~1.6.16",
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-        "vary": "1.1.2"
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@@ -1600,6 +1588,23 @@
       "integrity": "sha1-wcS5vuPglyXdsQa3XB4wH+LxiyY=",
       "dev": true
     },
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/filename-reserved-regex/-/filename-reserved-regex-2.0.0.tgz",
+      "integrity": "sha512-lc1bnsSr4L4Bdif8Xb/qrtokGbq5zlsms/CYH8PP+WtCkGNF65DPiQY8vG3SakEdRn8Dlnm+gW/qWKKjS5sZzQ==",
+      "dev": true
+    },
+    "filenamify": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/filenamify/-/filenamify-4.3.0.tgz",
+      "integrity": "sha512-hcFKyUG57yWGAzu1CMt/dPzYZuv+jAJUT85bL8mrXvNe6hWj6yEHEc4EdcgiA6Z3oi1/9wXJdZPXF2dZNgwgOg==",
+      "dev": true,
+      "requires": {
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+        "strip-outer": "^1.0.1",
+        "trim-repeated": "^1.0.0"
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@@ -1740,6 +1745,25 @@
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       }
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+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
+      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.2.0",
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
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+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.10.tgz",
+          "integrity": "sha512-9ByhssR2fPVsNZj478qUUbKfmL0+t5BDVyjShtyZZLiK7ZDAArFFfopyOTj0M05wE2tJPisA4iTnnXl2YoPvOA==",
+          "dev": true
+        }
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@@ -1778,7 +1802,8 @@
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           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -1799,12 +1824,14 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.11",
           "bundled": true,
           "dev": true,
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@@ -1819,17 +1846,20 @@
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-          "dev": true
+          "dev": true,
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           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
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+          "dev": true,
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@@ -1946,7 +1976,8 @@
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-          "dev": true
+          "dev": true,
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@@ -1958,6 +1989,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
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@@ -1972,6 +2004,7 @@
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           "dev": true,
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@@ -1979,12 +2012,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2003,6 +2038,7 @@
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@@ -2083,7 +2119,8 @@
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-          "dev": true
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@@ -2095,6 +2132,7 @@
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           "bundled": true,
           "dev": true,
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@@ -2180,7 +2218,8 @@
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-          "dev": true
+          "dev": true,
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@@ -2216,6 +2255,7 @@
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           "bundled": true,
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@@ -2235,6 +2275,7 @@
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           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2278,12 +2319,14 @@
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           "version": "1.0.2",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "3.0.2",
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@@ -2312,43 +2355,136 @@
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-      "integrity": "sha1-2VHj7Zi4VpnUsEGOsaFbGgSYjcE=",
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-        "graceful-fs": "4.1.10",
-        "q": "1.4.1",
-        "q-io": "1.13.2",
-        "rimraf": "2.6.2"
+        "async": "^2.6.1",
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+          "dev": true,
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@@ -2444,12 +2580,6 @@
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@@ -3098,6 +3228,15 @@
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+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
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+      "requires": {
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+      }
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       "resolved": "https://registry.npmjs.org/jsonify/-/jsonify-0.0.0.tgz",
@@ -3380,12 +3519,6 @@
         "mime-db": "1.33.0"
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-    "mimeparse": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/mimeparse/-/mimeparse-0.1.4.tgz",
-      "integrity": "sha1-2vsCdSNw/SJgk64xUsJxrwGsJUo=",
-      "dev": true
-    },
     "minimalistic-assert": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
@@ -4042,30 +4175,10 @@
       "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
       "dev": true
     },
-    "q": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/q/-/q-1.4.1.tgz",
-      "integrity": "sha1-VXBbzZPF82c1MMLCy8DCs63cKG4=",
-      "dev": true
-    },
-    "q-io": {
-      "version": "1.13.2",
-      "resolved": "https://registry.npmjs.org/q-io/-/q-io-1.13.2.tgz",
-      "integrity": "sha1-7qEw1IHdteGqG8WmaFX3OR0G8AM=",
-      "dev": true,
-      "requires": {
-        "collections": "0.2.2",
-        "mime": "1.6.0",
-        "mimeparse": "0.1.4",
-        "q": "1.4.1",
-        "qs": "1.2.2",
-        "url2": "0.0.0"
-      }
-    },
     "qs": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-1.2.2.tgz",
-      "integrity": "sha1-GbV/8k3CqZzh+L32r82ln472H4g=",
+      "version": "6.5.1",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.1.tgz",
+      "integrity": "sha512-eRzhrN1WSINYCDCbrz796z37LOe3m5tmW7RQf6oBntukAG1nmovJvhnwHHRMAfeoItc1m2Hk02WER2aQ/iqs+A==",
       "dev": true
     },
     "querystring": {
@@ -4950,6 +5063,15 @@
         "get-stdin": "4.0.1"
       }
     },
+    "strip-outer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/strip-outer/-/strip-outer-1.0.1.tgz",
+      "integrity": "sha512-k55yxKHwaXnpYGsOzg4Vl8+tDrWylxDEpknGjhTiZB8dFRU5rTo9CAzeycivxV3s+zlTKwrs6WxMxR95n26kwg==",
+      "dev": true,
+      "requires": {
+        "escape-string-regexp": "^1.0.2"
+      }
+    },
     "supports-color": {
       "version": "5.4.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
@@ -5039,6 +5161,15 @@
       "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
       "dev": true
     },
+    "trim-repeated": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/trim-repeated/-/trim-repeated-1.0.0.tgz",
+      "integrity": "sha512-pkonvlKk8/ZuR0D5tLW8ljt5I8kmxp2XKymhepUeOdCEfKpZaktSArkLHZt76OB1ZvO9bssUsDty4SWhLvZpLg==",
+      "dev": true,
+      "requires": {
+        "escape-string-regexp": "^1.0.2"
+      }
+    },
     "ts-loader": {
       "version": "2.3.7",
       "resolved": "https://registry.npmjs.org/ts-loader/-/ts-loader-2.3.7.tgz",
@@ -5163,6 +5294,12 @@
         "imurmurhash": "0.1.4"
       }
     },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "dev": true
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -5249,12 +5386,6 @@
         "requires-port": "1.0.0"
       }
     },
-    "url2": {
-      "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/url2/-/url2-0.0.0.tgz",
-      "integrity": "sha1-Tqq9HVw6yQ1iq0SFyZhCKGWgSxo=",
-      "dev": true
-    },
     "use": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.0.tgz",
@@ -5344,12 +5475,6 @@
         "minimalistic-assert": "1.0.1"
       }
     },
-    "weak-map": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/weak-map/-/weak-map-1.0.0.tgz",
-      "integrity": "sha1-tm5Wqd8L0lp2u/G1FNsSkIBhSjc=",
-      "dev": true
-    },
     "webpack": {
       "version": "2.7.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-2.7.0.tgz",
diff --git a/demo/package.json b/demo/package.json
index d2fb080..6189edc 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -14,7 +14,7 @@
   "devDependencies": {
     "copy-webpack-plugin": "^4.0.1",
     "cross-env": "^4.0.0",
-    "gh-pages": "^0.12.0",
+    "gh-pages": "^4.0.0",
     "rimraf": "^2.6.1",
     "ts-loader": "^2.0.3",
     "webpack": "^2.3.3",