removing unused javascript in application.js
removing unused javascript in application.js

nigelr/JavaScriptCasts,marcagas/railscasts,jfarver/railscasts,nischay13144/railscasts,ryanb/railscasts,marcagas/railscasts,nischay13144/railscasts,jfarver/railscasts,jfarver/railscasts,nischay13144/railscasts,marcagas/railscasts,ryanb/railscasts,nigelr/JavaScriptCasts