Fix tag cloud factor in generic app.
Version bump to 1.4.13
Added tag 1.4.13 for changeset 90aff0815bf0
Update auto-generated changelog, requirements.
Blog: Catch exception if a non-existent month is requested from the archives.
Version bump to 1.4.14
Added tag 1.4.14 for changeset e83ad5bdfedc
Blog: Generate RSS and Atom feeds through richtext_filters.
Update auto-generated changelog, requirements.
Merge.
Strip STATIC_URL, leading / from proxied URLs

STATIC_URL often contains host or generic_host (esp. if STATIC_URL is a
path on the same domain), so it needs to be removed first to ensure it
is removed completely. Also removed leading '/' from URL, since it
appears staticfiles doesn't like absolute paths.
New sites in README
Merge.
Added a function mezzanine.utils.urls.next_url which is used to retrieve redirect URLs from a request's next param, while verifying that the redirect URL is valid.
Fix min Dajngo version
Use request.get_host rather than request.META['HTTP_HOST']
Fix Django version for travis
Version bump to 1.4.15
Added tag 1.4.15 for changeset a24985814970
Update auto-generated changelog, requirements.