Merge branch 'release/0.28.2.7' into develop
update BS & font-awe in 502.
Update Gemfile with working modules.
flake8 & pep257 happyness…
Remove templatetags and social_pipeline functions that are in sparks now.
Split views into many files, for readability & maintenability.
add django-sorting.
update to sparks latest (develop).
flake8 & pep257.
Move user profile from core to base, cleanup and rassemble views & templates.
more CSS (blurred & profile).
Rewrite the basic API authorization class to allow using it in any nested user-owned relation.
Split reldb models and add Mail* models (+ migrations).
IMAP test script.
URLs, forms & views for MailAccount.
template tags for mailaccount.
templates for MailAccount.
RESTful API for MailAccount.
Django Admin for MailAccount.
Rename model field.