Added facets for tags in the search

Changed the haystack requirement to a fork of haystack
with a fix for faceting with Whoosh until it is implemented
in the main line
Facets are shown in the search
Facets are shown on the list page
Merge branch 'master' into tag-facets

Conflicts:
	functional_tests/tests.py
JS handler to toggle offcanavas rows
Cleaned up tests, removed duplication
Navbar block is now called navbar instead of sidebar
Show tags in a sidebar
Changed tag layout in searches
Merge branch 'tag-facets'

Added facets for tags for the index page and the search.
The project now uses a fork of django-haystack until
facets with Whoosh are implemented in the main line