Failing tests for href, class, booleans, value
Introduce AttrNode, new HTMLBars attribute syntax
Port attrs and classes via bind-attr to AttrNode
Add SVG attribute support
Support maxlength and nonmatching reflections
Add a feature flag for attribute syntax
Remove some closures
Allow multiple classes per stream
Improve test names
inline-if test for classes should expect that feature flag
Add a test showing a disconnected attr nodes fail silenty
process classes with a special concat walker
Attributes PR cleanup
Merge pull request #9721 from mixonic/attributes

[FEATURE ember-htmlbars-attribute-syntax] HTMLBars attributes syntax
Finish Refactoring View Tests for HTMLBars

https://github.com/emberjs/ember.js/pull/9769#discussion_r21162519

Standardize and Replace calls to `append` and `destroy` with helpers
wrapped in `run` calls.