Added json feed for calendar

I don't think this update is necessarily ready for merging with the main project, but I also don't think it would hurt anything either.

calendary.py - Disabled logic for index function as everything is handled via ajax now - Thanks Mike!
default.py - We're not supposed to edit this, but I couldn't log in without this fix.
dbcal.py - Added my_events function to return all events owned by a user. Added a function _get_events_json that takes a query and a list of fields and returns the results as a list of dictionaries suitable for passing to the json function.
index.json - added view to return json feed of my_events function.