Fix already created members
order talks by title
Merge pull request #57 from codebar/fix_already_existing_members

Fix already created members
fixed rspec description
Merge pull request #60 from DriftingWave/students_rsvp

fixed rspec description
change session invtation,
respond through interface not email
don't display sign up buttons if user is logged in
change invitation view
sessions + courses pages
send email when student confirms attendance
Merge pull request #61 from codebar/organisers-page

sessions + courses pages
Merge pull request #62 from despo/add-invitation-page-for-rsvp

Add invitation page for rsvp