Fixed clean_expired_users periodic task (enable abs imports pep-0328)
Feature #115 support several base images per arch
Cosmetics: replaced relative imports (PEP 8 #imports)
IMproved REST API errors when adding sliver ifaces
Added api exceptions
Bugfix #137: Group researcher cannot create slices
BugFix #139: Misleading title in state pages
Added support for double extensions on filesystem storage
comments
Rename unused variables to __
Added support for multiple default_changelist_filters
#115 note-3. Show always base image info when getting the firmware.
Fix permissions adding slivers in bluk mode
Avoid false msg error at successful firmware build.
Merge branch 'base_image_f115' of git.confine-project.eu:confine/controller into base_image_f115

Conflicts:
	controller/apps/firmware/models.py