Screen: removed trace() call.
added third party notes to license file.
Scroller: license header points to main license file.
List, GroupedList, ScrollContainer, Panel: better auto sizing. some reorganization.
third party license description tweak
FeathersControl: clipRect accounts for scaling (closes #352)
List, GroupedList, Panel, ScrollContainer, ScrollText: consolidated shared code into BaseScrollContainer class.
Removed BaseScrollContainer and made Scroller the base class of scrolling controls and containers. Refactored Scroller a bit to support subclasses that tweak the view port bounds.
Scroller, List, GroupedList: scrollTo* functions now invalidate again.
ScrollContainer: better display list bypass
Scroller: fix for missing scroll bars. removed a ton of unnecessary DisplayObject casts.
Scroller: mouse wheel scrolling now animates (set mouseWheelScrollDuration to 0 to remove animation).