PopUpManager: isTopLevelPopUp() properly checks if a pop-up is above an overlay (or if there are no overlays) instead of if it's the single top-most pop-up
Components Explorer: tweak to alert screen
Alert: support for optional icon to the left of the message text renderer (closes #725)
FeathersControl added isCreated to go with FeathersEventType.CREATION_COMPLETE to go along with isInitialized which goes with FeathersEventType.INITIALIZE
Merge branch 'master' of https://github.com/joshtynjala/feathers