Migrate Tooltip tests to TS
Decouple AppBarCommand and AppBar to be able to share command code with Toolbar
Pivot now adjusts headers layout with control size. Added and updated unit tests.
Fixes for jshint errors in pivot.js
Updated forceLayout usage in Pivot.
Migrate TimePicker tests to TS

Also remove disabled tests for old won't fixed bugs.
Migrate SemanticZoom tests to TS.
Migrate SearchBox tests.
Migrate Scheduler
Remove unnecessary test helper in test fixture.
Merge branch 'master' into AmazingJaze/_Overlay_backpressed