PEP8 fixes.
Added a page to manage groups.
SlotEditor now fulfills basic requirements.
Time format in manage page improved.
tmux server now supports 256 colours.
Fixed Firefox issues.
Style updates.
Manage view is now protected.
Added a small header with login link.
Minor fix.
Added tool-tip to groups in manager.
Added a glow to the tooltip.
Added an example group from the model.
Basic class custom. of Group and TimeSlot
Reduced tooltip size.