updated the interface to the primary methods on the Medium object. Event filters are passed as keyword arguments
tested filtering by event actor
updated queries to be much more efficient in the case where there are no only_following subscriptions
bumped version
entity event now uses datetime.max for the time expires instead of it being nullable. db indices were added to time and time expires
updated logic for supporting time expires with datetime max
Merge pull request #10 from wesleykendall/develop

Actor filtering and other improvements
Update 0004_convert_time_expires_to_max.py