Initial implementation of support for hierarchical facets (bootstrap3 only).
Refactored getFacetDataAjax to use smaller helper methods.
Merge commit '2d4cf84cf986499bb22825b32776a3708c325f56' into hierarchical-facets3

Conflicts:
	themes/bootprint3/css/compiled.css
	themes/bootstrap3/css/compiled.css
Fixed hierarchical OR facets.
Merge commit 'bf70ff901133cbfa169f8ac5424e8a8ec20d2276' into hierarchical-facets3

Conflicts:
	themes/bootprint3/css/compiled.css
	themes/bootstrap3/css/compiled.css
Made the hierarchical facet operator handling more flexible, robust and efficient.
Merge branch 'hierarchical-facets3'