Merge branch 'release/0.82.11' into develop
Mark orphans as absolutized so that they are displayed to the users.
check orphans absolutization.
Fix the mark_all_read() feature.
Reload the orphan.
switch to gevent in dev env and extract beat.
Use a mail accounts manager and change related_name.
More constance configs.
Move mail accounts to an account/ module and make them polymorphic to factorize code with Twitter and other upcoming accounts types.
Forgot some constance bits.
Fix mailboxes list not refreshing and launching tasks endlessly.
Fix email feeds not refreshing anymore and update calls with refactored code.
use refacored code here too.
keep trace of things to delete.
add inactive() query selector.
Implement a custom manager in feeds like I just did in accounts (+ related code changes).
move common things to common.
Export useful things.
items & articles also get a nice QS manager with many QS-easiing attributes.
Reads also get a nice manager, but without Polymorphic and in Django 1.6, there is much useless glue code. Looking forward Django 1.7.