AddOnFunctionStyleProvider: fixed issue where add on function passed to constructor was ignored (closes #1009)
Merge branch 'v2.0.x'
Scale3Image, Scale9Image, TiledImage: updated to use new flatten() function signature
Merge branch 'v2.0.x'
FeathersControl: can now flatten at any time, since validation is no longer restricted to after initialization
docs tweaks