2124: Add BillingRecord model
2124: Add post_save hook to create BillingRecord
2124: Add billing cut off date
2124: Add BillingRecord admin
2124: Move BillingRecord insertion to task
2124: Beef up BillingRecord admin
2124: Add billing cutoff date to billing view
2124: Add billing record gauge
2124: Wrap task in try/except
Merge branch 'production' into i-2124

Conflicts:
	apps/videos/tasks.py
Merge branch 'i-2124' into production