Adds code-coverage badge, code coverage reports, and test-cov script to master.

.travis.yml

@@ -10,9 +10,17 @@ addons:
     packages:
       - libgif-dev
       - g++-4.8
+  code_climate:
+    repo_token: 07de009e5f4d0a43c51b18f3443b2fe7ddcf3fea206e75c3a81b1c4030657f69
+cache:
+  directories:
+    - node_modules
 before_script:
   - npm run lint
   - npm install gulp
 script:
   - gulp
-  - npm test
+  - npm run-script test-cov
+after_script:
+  - npm install -g codeclimate-test-reporter
+  - codeclimate-test-reporter < ./coverage/lcov.info

README.md

@@ -38,6 +38,7 @@ The vis.js library was initially developed by [Almende B.V](http://almende.com).
 [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/almende/vis.svg)](http://isitmaintained.com/project/almende/vis "Average time to resolve an issue")
 [![Pending Pull-Requests](http://githubbadges.herokuapp.com/almende/vis/pulls.svg)](https://github.com/almende/vis/pulls)
 
+[![Test Coverage](https://codeclimate.com/github/codeclimate/codeclimate/badges/coverage.svg)](https://codeclimate.com/github/codeclimate/codeclimate/coverage)
 [![Code Climate](https://codeclimate.com/github/almende/vis/badges/gpa.svg)](https://codeclimate.com/github/almende/vis) 
 
 ## Install

package.json

@@ -27,6 +27,7 @@
   "main": "./dist/vis.js",
   "scripts": {
     "test": "mocha --compilers js:babel-core/register",
+    "test-cov": "nyc --reporter=lcov mocha --compilers js:babel-core/register",
     "build": "gulp",
     "lint": "gulp lint",
     "watch": "gulp watch",