add cartridge's RTL style
fix moblie front-end RTL style
Don't show site selection form when there's only one site

If there's only a single site, there's no need to show this form,
because it can't do anything.
Only show one reply form at a time in a comment thread.
Configurable page var names in pagination querystrings.
Pin max Django version to 1.5.x
Fix tweets/comments css.
Added noshly.com to sites in README
Added mezzanine-foundation to apps list in README
Merge
Added Mahdi Bornazadeh to AUTHORS
Merge
RTL: adjust admin navbar thickness after the js->css change
Added kabucreative.com.au to sites in README.
Moved all default project template bootstrap js tweaks into bootstrap-extras.js, and made a couple other minor default template cleanups.
Provide optional template for user panel in nav.
Update bugfix.

--HG--
branch : bugfix
Remove content from DisplayableAdmin's search_fields since content is not defined on Displayable and may or may not be present on a model that subclasses it and uses the DisplayableAdmin.

--HG--
branch : bugfix
Merge remote-tracking branch 'upstream/master' into inheritance-manager
Clean up nav version of user panel.