Replace the deprecated urls.defaults package with just urls (to be removed in Django 1.6).
Strip language prefix from request path, before trying to match it against pages slugs.
Merge branch 'feature/i18n-url-language-prefix-fix' into develop
Merge branch 'feature/miscellaneous-small-improvements' into develop
New USE_MODELTRANSLATION setting that adds modeltranslation to the optional apps; examples of configuration pieces needed for multilingual projects (LANGUAGES setting, i18n context processor and locale middleware).
Base admin class that can be added to model admins that may possibly have translation fields. If modeltranslation is enabled translation fields are displayed as tabs in place of the original fields, if it's not, nothing is changed.
Register all Mezzanines' models that contain some textual content for translation.
Allow convenient editing of translation fields in admin.
Avoid insterting translation fields into forms as extra fields, TranslationAdmin handles them properly on its own.
Merge branch 'feature/modeltranslation-integration' into develop

Conflicts:
	mezzanine/pages/admin.py