Fix typo

garentee -> guarantee
Merge pull request #3625 from Evster88/master

Fix a simple documentation typo
[BUGFIX beta] Incorporate latest ember-dev fixes.

Prevents testing of multiple branches unless specifically enabled.
Also, enables features from `features.json` for tests.
Merge pull request #3628 from rjackson/update_ember-dev

[BUGFIX beta] Incorporate latest ember-dev fixes.
Revert "[FEATURE em-o] Added `Em.O` (shorthand for `Ember.Object.create`"

Core team consensus is that users who want this shorthand functionality
in their own app can easily create this alias.

This reverts commit e5848449c728d01f93176f0de2c9bed533129a78.
Better feature flagging for container-renderables
Update for 1.3.0 Canary
Remove experimental control helper
Don't use unreleased versions in the Gemfile.lock
Try something else to fix Travis build
Remove old require