User notification uppon canceling of presentation
Merge branch 'master' of github.com:Samfundet/Bedpres
link in the flash message for the canceled presentation
Merge branch 'master' of github.com:Samfundet/Bedpres

Conflicts:
	db/schema.rb
Can remove notification box about cancelled presentation
Merge branch 'master' of github.com:Samfundet/Bedpres