Django-sitegate

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+ Added Czech localization.
+ Added Django 1.7 migrations.

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+ Django 1.7 ready.
+ Now using new `get_message_type_for_app` from sitemessage.

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+ Email verification procedure support added to modern signup flows.
+ Implemented a fallback to Django built-in mailing system if sitemessages is not available.
+ Implemented support for custom User models without `username` field.

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+ Implemented experimental email verification procedure.

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* Fixed the issue with upper cased blacklisted emails.
* Fixed blacklisted domains detection mechanics.
* Fixed Bootstrap 3 sign in template.
* Fixed redirect_signedin raising AttributeError (closes 7).

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+ Added Bootstrap 3 templates.
+ Added Polish localization (see 4).
+ Added support for Py2.6 (see 4).
* Fixed error rendering form field label localized texts (see 3).
* Adopted django-siteprefs API changes.