Create log dir before appending files
Get temp status or metadata on update_history, add username to the 'identifier'
PEP8 Compliance.
	modified:   api/serializers.py
Change the clear_empty_ips periodic task to every 20 minutes.
	modified:   atmosphere/settings/__init__.py
Bugfix - required variable missing, better data validation used
Moved relativedelta to a settings configurable, and set for today
Bugfixes: Catch SystemExit, better validation on POST requests, fixed clean_ips task
Merge resolved
remove ttz projection paragraph of modal when ttz is null
Merge branch 'herja' of https://github.com/iPlantCollaborativeOpenSource/atmosphere into herja
Bugfixes: Missed import, bad varname
Updated celery config to use the 'fair'//No-Prefetch option
PEP8 Compliance
Merge herja + a-n, PEP8 Compliance
Merge branch 'abyssinian-nightjar'