Ensure that initially null attributes are not added to element.
Implement block params
Add Code Climate badge
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
Split hooks into separate files.