Added spam reporting stuff into the API.
Linked spam reports to revisions instead of reviews.
Added basic spam reporting UI.
Added dump_data() function into server's manage.py
Merge branch 'master' into spam
Added confirmation for spam reporting.
Updated schema image in docs.
Fixed incorrectly displayed "Reporting..." message.
Updated error message related to spam reporting on server.
Renamed dump_data() function into dump_json().
Merge branch 'master' into spam

Conflicts:
	client/messages.pot
Updated spam report confirmation dialog.
Fixed incorrect exception being raised.
Made reporting less confusing by adding more statuses.
Updated messages.pot
Updated names of generated archives and directories.
Removed gravatars from JSON dump and fixed timestamp format.
Fixed avatar key name.
Merge branch 'dump'