SVG support.
Added a way to declare attributes and data binding of root node of
widget, in widget prototype.
Support for automatic call of change callback at widget initialization.
Hover over support and half values support in <d-l-star-rating>.
Fix in ObservablePath#discard().
Let TemplateBinder and widget manage compute properties.
Test case update for <d-star-rating>, catching up with latest change in that widget.
Another test case update for <d-star-rating>, catching up with latest change in that widget.
Disabled <d-star-rating> test cases in Polymer until https://github.com/ibm-js/deliteful/pull/92 is merged.