Added option to choose which detection strategy to use. Added onReady option callback to be called when all elements of the listenTo are ready.
Added option to choose which detection strategy to use. Added onReady option callback to be called when all elements of the listenTo are ready.

wnr/element-resize-detector,wnr/element-resize-detector,m59peacemaker/element-resize-detector,m59peacemaker/element-resize-detector