adds realm
adds puma
fixes issue with updating deliveries
Merge branch 'master' into realm_introduction

Conflicts:
	app/models/delivery.rb
fixes incorrect regex in slug
readds before_create-hook to delivery, so bookings will be created
inital implemntation of realms
Merge branch 'master' into realm_introduction

Conflicts:
	app/models/delivery.rb
adds realm resources
adds active_flag to realm, fixes #8
Merge pull request #23 from Uepsilon/realm_introduction

Realm introduction