Change 'System URL' to 'Direct URL' on System/Process form
Merge pull request #55 from reciprocity/feature/change-system-url-to-direct-url

Change System URL to Direct URL
Create barebones prototype
Set revison.content type to TEXT
Migrate events.http_method datatype to enum

Clean up tab spacing to 2 chars
Remove redundant setting of created_at as it is handled by the
framework
Merge remote-tracking branch 'origin/feature/log_events' into feature/log_events

Conflicts:
	src/ggrc/models/mixins.py
	src/ggrc/services/common.py