Remove unused tasks

Currently ember is managed by `ember-source` gem.
Remove unnecessary comment
Remove unused helper
Remove unused variables
Merge pull request #1021 from tricknotes/remove-unused-tasks

Remove unused tasks
Merge pull request #1020 from tricknotes/remove-unused-valiables

Remove unused valiables
English, do you speak it?
Merge pull request #1028 from bcardarella/grammar

English, do you speak it?
bump ember-dev
Add warning
Merge pull request #1032 from ahawkins/empty-root-warning

Add warning when load request, but not data given
first pass at uncatchable assertions
Fix failing tests due to promise-hidden exceptions and uncatchable assertions
Remove expectAssertion in favor of ember-dev
Merge pull request #1033 from stefanpenner/uncatchable_assert_and_fixes

Uncatchable assert and fixes
Remove bundled jQuery

ref: emberjs/ember-dev#21
Merge pull request #1037 from tricknotes/remove-bundled-jquery

Remove bundled jQuery
Allow metadata value to be zero
Merge pull request #1042 from bradleypriest/zero-meta

Allow metadata value to be zero