No really, fixed issue with Strava activity list hanging the sync process
Merge branch 'dev'
Additional sträva activity listing debug
Improved efficiency of Endomondo activity listing
Fixed issue where Dropbox activity listing exclusions would crash the sync
Track ancestor accounts when merging happens on authenticate
Fixed case with Endomondo where activities who's TZ was indeterminate were not excluded
Changed endomondo activity metadata cacheing to pickle the TZ instead of relying on str()
Skip RK activities with missing keys
Reduce the amount of useless data logged with sync errors
Tweaked sync process to allow multiple concurrent workers without double-synchronization.
Additional check in Strava to ensure the TZ it returns is proper.
Added handling in _accumulateActivities so cases when activities appear to be duplicate, but otherwise would not be recognized due to a timezone shift.
Misc. unit test cleanup + repair