Improve CoffeeScript support

Additions
- New folder for CoffeeScript related files
- Make grunt-neuter play nicely with CoffeeScript
Merge branch 'fayimora-coffee-script-support'
Readme.md explains --coffee option
Merge pull request #40 from kraftwer1/master

Readme.md explains --coffee option
Upgrade ember, handlebars
Merge pull request #43 from fayimora/upgrade-ember

Upgrade ember and handlebars
use grunt-contrib-watch.