Hierarchical facet ui revision 2

This styles the tree to look like the non-Hierarchical search facet widgets and changes behaviour. Choosing  a leaf causes the results to narrow.

Still to come: replace tree with label and checkbox when a leaf is chosen
This if block needs braces.

Also on the line above you seem to have assumed that cfg.title has a value, so maybe this if block isn't needed if that's the case?