add single-run mode for ci

Author: lathonez

package.json

@@ -8,7 +8,8 @@
     "build": "ionic-app-scripts build",
     "ionic:build": "ionic-app-scripts build",
     "ionic:serve": "ionic-app-scripts serve",
-    "test": "karma start ./test-config/karma.conf.js"
+    "test": "karma start ./test-config/karma.conf.js",
+    "test-ci": "karma start ./test-config/karma.conf.js --single-run"
   },
   "dependencies": {
     "@angular/common": "2.4.8",