Added google calendar to posters

Changed event_date in posters to event_start_date and event_end_date so
that we could tell google calendar how to schedule the event, also
probably just a good idea in general
Started work on Twitter login
Revert "Started work on Twitter login"

This reverts commit d674dfa3d1c48363ff1389057e6b1e1f84f05195.
Trying to add calendar view
Revert "Trying to add calendar view"

This reverts commit d33b7492ef585cd943ce461580d4847a0a510b9b.
Adding more content to poster views
Adding description search to posters#mainlist
Changing mainlist to filter by event_start_date
Added location and time to posters
Merge in Jacob's code and fix tiny bugs