Pybbm

* Fixed MultipleObjectReturned when topic has more than one moderator

* Fixed circular import issue

* Restored views for rendering user's posts and topics and link to that views from profile info page
* Broken hard dependency from EditProfileView and EditProfileForm classes in forum
* Ability for users to cancel their poll vote
* Block user view accepts only POST requests
* If `block_and_delete_messages` passed to request.POST for block user view,
then all user's messages will be deleted

* Hotfix for rendering avatars

* You can add first-unread get parameter to the topic url to provide link to first unread post from topic
* Removed django-mailer, pytils, sorl-thumbnail, south, django-pure-pagination from hard dependencies
* Support Custom User model introduced in django 1.5. Do not forget to define `PYBB_PROFILE_RELATED_NAME`
in settings, if you don't use predefined `pybb.PybbProfile` model See `how to use custom user model
with pybbm</customuser>`
* Dropped support for django 1.3
* Experimental support for python 3
* Removed django-mailer from hard dependencies, you have to manually install it for using it's functionality

* More flexible forms/forms fields rendering in templates
Strongly recommended to check rendering of pybbm forms on your site (edit profile, poll/topic create/edit)
* Additional template for markitup preview
You can override `pybb/_markitup_preview.html` to provide your styling for <code>, <pre> and other markitup tags
* Improved permissions handling see `PYBB_PERMISSION_HANDLER` setting in `settings</settings>`
* Fixed bugs and improved performance