Converts project from Coffeescript to vanilla Javascript

I was trying to sort out a couple of other issues but coffeescript was hindering me. Done this PR to try and move things along.

Created a script to convert files in app and src directories. 
Converted files. Changed gruntfile to remove coffeescript stuff and fix build. 
Removed all references of the coffeescript build directory from code. 
Tweaked a computed property which was converted wrong.

Everything seems to be working in the examples.
Yep, unless I'm missing something I don't see them used anywhere else in this function.

Searching the code for "_i" also shows a couple other conversion problems. I think the only times we should be using underscores at the start of variable names are (1) to signify that something is private, and (2) _this = this. Any other places this appears is likely to be a remnant of CS conversion and should be cleaned up.