jsTree css and truncateNames

Hi Douglas,

 A couple of minor fixes.
 - I've ported some of the jsTree css from develop, so the tree looks pretty much the same as before.
 - Also shortened the target name truncation length, since it wasn't keeping within the left panel.
 - jsTree hotkeys: Left now selects the parent. Previously the parent was highlighted by light-blue but not selected - selection was the previous sibling node.

Hope that helps...