start moving ember-metal to es6
move even more ember-metal files toward es6!
Finish es6ifying syntax.
Update custom transpile-packages to support many libs
Extra cases where ArrayPolyfills was destructured
Properly expose beforeObserver in es6 module syntax
Beginning to move ember-runtime to es6 module syntax
s/Error/EmberError in computed
ES6 moduleify a bunch of mixins
Convert controllers and computed property macros to es6 modules
Fix syntax error in metal/libaries export
Fix sytax errors in es6 format of ember runtime conversion
Remove non-es6 ember-metal/main.
Include testBoth helper via ES6.
Move window.Em into main.
Fix typos in get/set import.
Ensure EmberError inherits from Error.
Fix more ES6 imports/exports.
Use `amd.js` suffix for vendored code.
Fix ember-meta/run_loop export.