Revert "remove Ember.metaPath" still used by Ember Data

This reverts commit 8b6a5df5cef40231bf2a786eb82530706873a520.
Make Evented#on, #off, and #one chainable
use allowedKeys instead of allowed-keys for consistency
Fixed wrongly-labelled submodules
replaced unnecessary __conatiner__ reference
Remove unused variables
Merge pull request #2269 from tricknotes/remove-unused-variables

Remove unused variables
Merge pull request #2266 from machty/small-container-fix

replaced unnecessary __container__ reference
Merge pull request #2265 from machty/submodule-typos

Fixed wrongly-labelled submodules
Merge pull request #2258 from rykov/evented-chain

Make Evented#on, #off, and #one chainable
Merge pull request #2263 from tchak/alowedKeys

Use allowedKeys instead of allowed-keys for consistency
Deprecate setting tagNames on Metamorphs - Refs #2248
Never initialize App synchronously, schedule instead

Instead of wrapping initialize in Ember.run, we now schedule it
as part of the actions queue. In the event that the DOMReady
has already fired, this allows time for App.deferReadiness()
to be called.
Merge pull request #2229 from stefanpenner/fixup_app_boot

WIP: Fixup app boot
Fix deprecation warning in tests
Fix render helper with model when used multiple times
allow tag for tagName in the view helper
Remove unnecesaries
Merge pull request #2278 from tricknotes/remove-unnecessaries

Remove unnecesaries
Fix typo and remove unused variables