Move coverage into it's own target

Author: SimenB

.travis.yml

@@ -1,6 +1,8 @@
+sudo: false
 language: node_js
 node_js:
   - iojs
   - 0.12
   - 0.10
+script: npm run cover
 after_success: cat coverage/lcov.info | node_modules/.bin/coveralls --verbose

package.json

@@ -24,8 +24,10 @@
   "scripts": {
     "clean": "rimraf coverage/",
     "lint": "jscs index.js test/ & jshint index.js test/",
-    "pretest": "npm run clean && npm run lint",
-    "test": "istanbul cover _mocha"
+    "pretest": "npm run lint",
+    "test": "mocha",
+    "precover": "npm run lint && npm run clean",
+    "cover": "istanbul cover _mocha"
   },
   "repository": {
     "type": "git",