HTML generation in Celery.
Always attempt to build HTML and fix_tree_tags when publishing a book. Also, some test fixes.
Attempt at Django 1.7
newtagging refactor
Django 1.7, working version.
Add Book.ancestor m2m.
Remove *.*_counter, *.related_info, Tag.*_count model fields.
Some cleaning.
Add support for fabfile_local.py
Update NOTICE.
Add mock Search class for development.
Display fixes: shelf tags, search results.
Using cache middleware instead of various caching micro-strategies,
together with django-ssify for two-phased rendering.
Remove dynfunctional, unused and undocumented  API.
Finally, what looks like correct ancestry-aware counters on related tags
(it's a shame all tests were passing, probably need more of those).
Removed unneeded build_absolute_uri tag.
Use secure transport for requirements.
Bug fixes.
Widget upgrade.