Frequency map

Tested frequency map. Finds the closest frequency for a given number and returns how often frequent you should (do a thing) with that number.

This is going to be used to inform the emailer how often we should mail people about datasets being out of date.
Changed frequency for realtime collectors to alert very hour.
Fixed faketimers. Hate dates
Fixed timezone issues for this test
Added frequency check.

If the frequency for dataset exceeds the time stored in backdrop we send another alert.

Added tests for this.