Some fixes
0.8.28
Improved execution.script style
Fixed bugs and added improvements on maintenance operation
Added refresh action on state app
Added refresh action on state app
Improved refresh action on state app
Added traceback to maintenance operations
Improved firmware generation progress bar resiliance on server-side failures
Fixed firmware generation knowladge of what was the  base image used for an specific build
Added firmware generation db schema migrations
Splited firmware progress_bar.js into a dedicated static file
Cosmetics
Fixes on the API
Execute get_state isolated on a thread because gevent is only usable from a single thread
Fixed problem with firmware.models.Build.base_image migration
Fixed migrations for firmware.build.base_image
Make sure celerybeat executes as unprivilege user
Fixed celery var/log creation
Added datetime timezone awearness