Make shop templates extend shop/base.html.

The change allows a site to supply shop-specific base.html, potentially
overriding or extending the global base.html.
Add SHOP_USE_RATINGS (default True), allowing ratings to be disabled.
Added Mike Wakerly to AUTHORS.
Merge
Merge
Remove deprecated ADMIN_MEDIA_PREFIX.
Use Django's timezone support since Django 1.3 is not supported.
Added kegbot.org to sitesin README.
Sync .po files with transifex
Merge latest changes from Steve
Update .po files for latest revision
New translations and languages from transifex
Update .mo translation files
Bump Mezzanine version to 1.4.4
Version bump to 0.8.2
Added tag 0.8.2 for changeset 8d1ea0a425de
Update auto generated CHANGELOG, settings docs.
Make wishlist optional by SHOP_USE_WISHLIST setting
Fix line length >80
Added new site to README.