Add roles as nested routes to track (for the track organizer role)
Allow transition from to_accept to to_reject and backwards
Split Track#valid_dates validation to many independent ones
Show all the confirmed tracks in the conference's splashpage
Add comment in admin/Tracks#toggle_cfp_inclusion
Rewrite admin/TracksController#accept spec
Add feature spec for track requests
Change 'In' to 'Room' in Tracks#index
Rewrite Track#overlapping
Refactor code in ProposalsController
Fix typos
Added PhysicalTicket model and controller. It holds the information about each physical ticket bought at the purchase. Physical Tickets are created after every successfull payment.
If the registration period is over then speakers of confirmed events
can't register anymore. They should be able to, since they are gonna be
there anyway.
* Allow the speakers of confirmed events to register regardless of the
registration period
* Provision for registrations of confirmed speakers, so as not to
exceed the registration limit
* Add scope for registered speakers
Fix#829 and fix#802
