Ensure that initially null attributes are not added to element.
Implement block params
failing test showing infinite recursion w/_super

refs emberjs/ember.js PR #9651
Add Code Climate badge
[BUGFIX canary] fix this._super infinite loop

fixes a regression introduced in #9651 that would
not reset the super function, causing an infinite
loop.
Merge pull request #9674 from rwjblue/htmlbars-initially-null-attributes

Ensure that initially null attributes are not added to element.
Merge pull request #9677 from mmun/block-params

Implement block params for HTMLBars
Merge pull request #9680 from JacobNinja/master

Add Code Climate badge
Merge pull request #9678 from fivetanley/super-causing-infinite-recursion

[bugfix canary] failing test showing infinite recursion w/_super
Add tests for a morph-inside-virtual-view-during-rerender bug
updates htmlbars version