AnchorLayout: fixed issue where items positioned relative to horizontalCenterAnchorDisplayObject or verticalCenterAnchorDisplayObject were not positioned correctly when the anchor was at a higher depth (closes #1057)
BitmapFontTextEditor, TextBlockTextEditor: fixed issue where clearing the text on focus in would cause the selection range to be invalid (closes #1054)
BitmapFontTextEditor, TextBlockTextEditor: cleaned up some messy code in selectRange()
BitmapFontTextEditor, TextBlockTextEditor: uses flash.events.Event.SELECT_ALL instead of manually checking for ctrl+a, since that didn't work properly on mac