Adding codecov

Author: amitayh

.travis.yml

@@ -1,4 +1,13 @@
 language: node_js
+
 node_js:
   - 0.12
-  - 0.11
+  - 0.11
+
+install:
+  - npm install -g codecov
+
+script:
+  - istanbul cover ./node_modules/mocha/bin/_mocha -- specs
+  - codecov
+

README.md

@@ -1,4 +1,5 @@
-# lispjs [![Build Status](https://travis-ci.org/amitayh/lispjs.svg?branch=master)](https://travis-ci.org/amitayh/lispjs)
+# lispjs [![Build Status](https://travis-ci.org/amitayh/lispjs.svg?branch=master)](https://travis-ci.org/amitayh/lispjs) [![codecov](https://codecov.io/gh/amitayh/lispjs/branch/master/graph/badge.svg)](https://codecov.io/gh/amitayh/lispjs)
+
 
 Simple Lisp implementation in JavaScript. [Web REPL demo](http://amitayh.github.io/lispjs/)