Added: css transitions, some features, improved flux workflow.
Fixed: mailbox config buttons layout. Refactored animations to use translation (gpu)
Cleaned up styles
Minor changes: added comments, removed useless logging, ...
Improved: mailbox' submenu styling
Added: fade effect to mailbox config link
Added: a marker for the active email in emails list
Fixed: if there is no data in the backend, fixtures are loaded instead
Dirty adjustments to make responsive work for now
Minor fixes to mailbox config/new form
Built sources