Extend $.fn.uls render method to add additional rendering of display
settings link.
Add css for the new element.
Add display.png icon from the Agora icon set.
Change-Id: I7a29b4892be02526969b0dd786c74bdb7551c074
* Seperating standalone jQuery ULS plugin and extension related code
* lib/jquery.uls can be submodule, but not now.
Change-Id: I7d9cb47daa88dd1a27ceda602a08cab0073caf33