[travis test] setup coveralls config + update README badges

.travis.yml

@@ -16,6 +16,10 @@ before_install:
 script:
   - npm test
 
+after_script:
+  - npm run cover
+  - npm run coveralls
+
 matrix:
   allow_failures:
     - node_js: "0.10"

README.md

@@ -1,6 +1,6 @@
 # nconf
 
-[![Version npm](https://img.shields.io/npm/v/nconf.svg?style=flat-square)](https://www.npmjs.com/package/nconf)[![npm Downloads](https://img.shields.io/npm/dm/nconf.svg?style=flat-square)](https://www.npmjs.com/package/nconf)[![Build Status](https://img.shields.io/travis/indexzero/nconf/master.svg?style=flat-square)](https://travis-ci.org/indexzero/nconf)[![Dependencies](https://img.shields.io/david/indexzero/nconf.svg?style=flat-square)](https://david-dm.org/indexzero/nconf)
+[![Version npm](https://img.shields.io/npm/v/nconf.svg?style=flat-square)](https://www.npmjs.com/package/nconf)[![npm Downloads](https://img.shields.io/npm/dm/nconf.svg?style=flat-square)](https://www.npmjs.com/package/nconf)[![Build Status](https://img.shields.io/travis/indexzero/nconf/master.svg?style=flat-square)](https://travis-ci.org/indexzero/nconf)[![Coverage](https://img.shields.io/coveralls/indexzero/nconf.svg?style=flat-square)](https://coveralls.io/github/indexzero/nconf)[![Dependencies](https://img.shields.io/david/indexzero/nconf.svg?style=flat-square)](https://david-dm.org/indexzero/nconf)
 
 Hierarchical node.js configuration with files, environment variables, command-line arguments, and atomic object merging.
 

package.json

@@ -18,13 +18,15 @@
     "yargs": "^3.19.0"
   },
   "devDependencies": {
+    "coveralls": "^2.11.4",
     "istanbul": "^0.4.1",
     "vows": "0.8.x"
   },
   "main": "./lib/nconf",
   "scripts": {
     "test": "vows test/*-test.js test/**/*-test.js --spec",
-    "cover": "istanbul cover vows -- test/*-test.js test/**/*-test.js  --spec"
+    "cover": "istanbul cover vows -- test/*-test.js test/**/*-test.js  --spec",
+    "coveralls": "cat coverage/lcov.info | coveralls"
   },
   "engines": {
     "node": ">= 0.4.0"