Prototype queue processing for actions.
add rq to requirements
rq test fixture
unit tests for local client actions
implement and test local thread copy
Better docstrings for FolderItem/ImapUid
[SCHEMA] add inbox folder name cols to imapaccount
IMAP sync backends now save folder names when sync starts.
Less ambiguous name for test_events.py
Remove duplicate lower() call.

We already make sure all members of existing_labels and new_labels are
lowercase.
Canonicalize All Mail to be 'archive' in our datastore
Update test dump for new ImapAccount columns
Canonicalize folder_names keys as lowercase

As a part of this, I'm also simplifying the logic in Gmail's
folder_names() detection to get rid of the janky usage of
boolean flags.
Update local actions to take advantage of new datastore folder abstraction
Ow, that's a bug
Add redis-server to VM deps
Add a backref to message to access associated imapuid
implement gmail syncback actions
syncback tests
Disable crispin's usage of readonly=True on select

OK, this is getting real now. :)