WIP ES6 lol

needs some work still, like travis and pulling ember and building it and yadayadayada.

available for some early feedback.

todo (i am sleepy so this is nowhere near complete):

- travis
- clean up grunt tasks
- see if some of the `syncForTest` stuff can be extracted to `Em.Test` cuz man this stuff is a pain in the kiester
- decide whether to use `DS.<Something>` instead of importing the module inside function calls (ping @stefanpenner)