Layouts: added missing inherited event docs for layouts
build script tweak
LayoutExplorer: tweaks to layout default settings
Layouts: added manageVisibility property (closes #302)
ScrollContainer: view port updates layout when scrolling (to support visibility changes on scroll, among other possibilities)
Scroller: removes native stage events on dispose (closes #458)
Header: responds to resizing leftItems or rightItems (closes #456)
Header: responds to resizing leftItems or rightItems (minor tweak)
Item renderers: handles accessory resizing (closes #385)
duplicate variable