Limit the geocode content item task to run once per second.
Update the feeds every 5 minutes
Ignore results from geocode task, and limit retries
Use a result backend for celery
Add log message for scheduling geocode
Correct the CREATED datetime for events
Change the rate limit on geocoding to once per minute
Update the tests to make sure that geocode is not called when a calendar item does not change
Add ability to control the refresh rate with an environment variable on DotCloud
Limit the geocode content item task to run once per second.
Merge branch 'master' into frequent-updates

Conflicts:
	website/alexander/tasks.py
Remove events that are deleted from the source calendar