Abstracting AppBar Layout implementations into new _Layouts file.
"custom" layout AppBar uses private _AppBarBaseLayout class.
"commands" layout AppBar uses  private _AppBarCommandsLayout class, which is derived from _AppBarBaseLayout.

Added new AppBar unit tests and fixed 2 Failing Menu/MenuCommand tests in WWA
Fixed NavButtonsPosition test to adjust values for the redline update. Removed a race condition from a couple unit tests. Fixed a PivotItem test that would fail on chrome due to not being inserted into DOM before asserting styles.
Remove unused configuration variables.
Put proper AMD wrapper around all source files.
Bunch of work on #212 to make rating unit tests pass in webkit
Change touch event creation to use MouseEvent
Don't test pointerCapture when it isn't available, translate incorrect "touchdown" to "touchstart"
Document helper methods and fix some style problems
Change interface to setFlexStyle
Fixed bugs for IE10 support and all IE10 tests are now green.
IE10 is a special case where it claims to support snap points but doesn't.
Fixing pivot tests