Header: better handling of NaN dimensions
ImageLoader: saves texture frame for use in measurement instead of using width and height directly on texture because the frame may be bigger.
Header: vertical middle alignment accounts for padding
Label: exposes baseline
Screen: auto-sizes based on content if explicit dimensions aren't provided
Transitions: support for skipping a single transition
StageTextField: wordWrap is also enabled when multiline is enabled (closes #319)
ScreenNavigator: added hasScreen() and getScreenIDs() (closes #317)
List, GroupedList: scroll step is same for both horizontal and vertical
LayoutViewPort: fixed scroll step calculation (closes #303)
BitmapFontTextRenderer: added useSeparateBatch property to control whether the renderer has its own QuadBatch or uses the global batching.
IGroupedListHeaderOrFooterRenderer: like the item renderer, must be IFeathersControl
ListDataViewPort, GroupedListDataViewPort: better disposal of item and header/footer renderers (sets owner and data to null)
ImageLoader: better texture and bitmapdata disposal.
Merge branch 'master' into 1.1pre
IFeathersControl: added some more public functions from DisplayObject to the interface
IFeathersControl: moved display object functions to IFeathersDisplayObject
added ILayoutObject and implemented it on FeathersControl
ValidationQueue: can handle call to purge on juggler(). better handling of new Starling instance. (closes #326)
IFeathersDisplayObject: moved event dispatcher functions into IFeathersEventDispatcher