refactored to use STI for rsvps, with different state machines in the different classes
RsvpWithWaitlist works on model-level
rsvp_type in event _form
display of rsvp almost done
converted rsvp_form to send event-names
more i18n for rsvps - not perfect yet
Merge branch 'master' into feature_state_machine_for_rsvp
Merge branch 'master' of github.com:learnery/learnery
fixed problem in migration
a little i18n