New spark-button
Adjustments
Merge remote-tracking branch 'upstream/master' into rework-spark-button
Listen to changes in all attributes using standard Polymer means, not ad-hoc way
Merge remote-tracking branch 'upstream/master' into rework-spark-button
Merge remote-tracking branch 'upstream/master' into rework-spark-button
Add `active` attr to SparkButton (no condfusion with former `active`, which was in fact `enabled`)
Hack/fix: menu button got stuck in 'active' state, didn't see updates
Remove non-working data bindings for now
Reformat
Merge pull request #1867 from ussuri/rework-spark-button

Rework spark-button to fix numerous issues