Minor performance optimization for entityview initialization

Take entityview widget subject out of the DOM before initializing the widget. This will prevent all
events triggered during initialization from bubbeling higher up the DOM than necessary. This will
give a little performance boost, especially on bigger entities. Depending on the browser I have
measured performance improvements of up to 25%.

Change-Id: I19b17aac0c1bf198c93183791791e1c9bc4900ea
Merge "Minor performance optimization for entityview initialization"