Fix Django version for travis
Version bump to 1.4.15
Added tag 1.4.15 for changeset a24985814970
Update auto-generated changelog, requirements.
Revert broken static proxy change.
Better fix for static proxy urls.
Version bump to 1.4.16
Added tag 1.4.16 for changeset 29f28b33f710
Update auto-generated changelog, requirements.
Forms: Migrated mezzanine.forms to BS3 and added custom styles.
Forms: Fix jQuery snippet to correctly focus the first form input.
Convert pagination template to BS3.

- pagination class is applied to ul, not wrapper div
- Page info element should be a span, not an anchor, since is not
meant to be clicked.
Convert right panel to BS3 in base.html.

Also remove excesive top margin in the first header of a panel.
Convert mezzanine.blog to BS3.

Includes blog post list, detail, filter panel and custom styles.
Remove excessive whitespace from mezzanine.css.
Convert ratings to BS3.
Display messages in the alternative blog post list views as info alerts.
Convert search results to BS3.
Convert error pages to BS3.

- Don't leave the meta title empty.
- Present the error in a panel.
Convert gallery to BS3 and use Magnific Popup with it.