Update .gitignore

Author: AshwinH

.gitignore

@@ -10,17 +10,12 @@ pids
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
 
-# Coverage directory used by tools like istanbul
-coverage
-
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
 # node-waf configuration
 .lock-wscript
 
 # Compiled binary addons (http://nodejs.org/api/addons.html)
 build/Release
+bundle.js
 
 # Dependency directory
 # https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git