Added tests for rejecting and approving friends
Going through runs to get mile pace - WIP
Added time formatter, but doesn't yet work for runs over 2 hours
Finished all methods for a single run
Added aggregate stats for all a user's runs
Added fastest run for a user and fastest mile pace
Finished all aggregate run methods to allow users to find out their stats
Changed to find_or_create_by_provider_and_uid to fix login bug