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
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.
ImageLoader: fix for changed RectangleUtil.fit() signature (closes #328)
readme tweaks for 1.0
updated release notes for 1.0
readme: added link to Github
optimized imports
added Github link to docs footer
copyright headers