Fixes issue #49
Fixes issue #50, so the date has to be in past time
Fixes issue #48
Merge branch 'feature/bugfix' into develop
fix issue #44
Clean up signup action
clean the signup, (issue #24)
Merge branch 'feature/signup' into develop
add: correct mailer texts, issue #46
Seeds file for production
Fix: fromField in mailer
Fixes issue #27
Refactor a bit
Hotfix password validation
Fix issue #52
Fix issue #53
Add: booking header directive
Move filter to directive (should have been a directive all along)
Fixes issue #45
Update: admin creation of bookings do no longer automatically accept bookings