Slider, ScrollBar, ToggleSwitch: TRACK_LAYOUT_MODE_STRETCH given a better name
Header: docs additions
StageTextTextEditor: invalidates on added to stage so that the newly created StageText receives all of the correct properties.
added some @see links in docs
VerticalLayout, HorizontalLayout: better handling of variable item dimensions and visible indices (closes #301)
Uses Simplified BSD License to match Starling Framework.
fixed build to point to LICENSE.md
Label: can handle null strings without creating an empty string.
updated license headers
BitmapFontTextRenderer: fix for word wrap putting characters before 0 x position (closes #293)
docs updates
Button: better validation of icons and skins that implement IFeathersControl, like ImageLoader
IFeathersControl: better docs
fixes for missing semicolons and other stuff that FDT is strict about (closes #252)
TabBar: docs improvements
List: better default layout and scroll policy handling in initialize().
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