Remove utc_now mock patch from rules_engine tests.

Small refactor. Tests are now done with a subclass of RulesEngine that
overrides utc_now() to insert fake times.
Added new action 'increment'.

Currently, this is mostly useful as a way to test things that fire actions
without having to mock out handle_action.

Switched all tests in test_actions to create their own status instead of
using a shared instance.
Remove extra run scripts.

Add -setup option to run_server, which now replaces virtualenv_run_server.