allow admins to enable/disable workers from AWS
Add displaying submission limits in CWS
Improve performance of counting statistics of submissions for overview page
Fix ContestImporter.py to work with .zip files
Merge branch 'fix-contest-import-zip' of https://github.com/artikz/cms

Fix ContestImporter.py to work with .zip files
Merge branch 'optimize-submissions-counting' of https://github.com/artikz/cms

Improve performance of counting statistics of submissions for overwiev page
Merge branch 'display-submission-limits' of https://github.com/artikz/cms

Add displaying submission limits in CWS
Merge branch 'aws-control-workers' of https://github.com/artikz/cms

allow admins to enable/disable workers from AWS