Convert Time objects to integers for mixpanel consumption, also test #properties_hash a little.
Since time now gets converted to an integer, the queued event tests need to be updated, while I'm at it lets update mixpanel_queue_should_include to also check the event type
Stick with hashrockets as ruby 1.8 needs them
Merge pull request #120 from reconbot/time.to_i

Time.to_i