Included pybb Forum app, updated requirements and settings
Included static context processor
New app pybb_custom for customizing Forum behavior
Updates in base.html template to show messages and breadscrumbs
Added namespaces for URLs
Some PEP8
Added Pybbm forums app with some customizations and several templates overriden to adapt to Bootstrap3
Customized django_registration_email to enable Nickname on signup
Minor update in User model so that username (nickname for us) is not Unique and can be blank
Updated requirements
Ignore media folder
Ignore cache folder
Merge branch '25-forum' into develop