Add node testing and running tests in docker

Author: mrako

.travis.yml

@@ -1,4 +1,10 @@
 sudo: required
 
+language: node_js
+
 services:
   - docker
+
+before_install:
+  - docker build -t mrako/wait-for .
+  - docker run mrako/wait-for

package.json

@@ -1,4 +1,7 @@
 {
+  "scripts": {
+    "test": "./node_modules/.bin/bats wait-for.bats"
+  },
   "dependencies": {
     "bats": "^0.4.2"
   }