VE-1247: Simplified logic for floating context menu using FocusedNode boundingRect

https://wikia-inc.atlassian.net/browse/VE-1247
Easily test on: http://muppet.christian.wikia-dev.com/wiki/The_Muppet_Show?veaction=edit
Property "boundingRect" should be access via getter (except for $element and maybe couple more).