Prototype queue processing for actions.
add rq to requirements
rq test fixture
unit tests for local client actions
implement and test local thread copy
Less ambiguous name for test_events.py
Update local actions to take advantage of new datastore folder abstraction
Ow, that's a bug
Add redis-server to VM deps
implement gmail syncback actions
syncback tests
Disable crispin's usage of readonly=True on select

OK, this is getting real now. :)
change thread_id arg in crispin to g_thrid

It's too confusing the way it is---it conflicts with our thread_id
columns in the models.
pluralize actions submodule to be more in line with models
s/uidvalidity_callback/uidvalidity_cb/g

cb is a pretty standard abbreviation for callback, and using it makes
the function name a bit less unwieldy.
Note about rationale for splitting out write actions
Document funny Gmail IMAP behaviour involving labels
Make IMAP connection readonly bit configurable

Aaand it defaults to True, for paranoia's sake.
inbox script launches actions worker
bump a couple reqs

Trying to see if bumping zerorpc/zeromq fixes some bugs I'm seeing.