increase session modal width
render flash on confirmation page
added send_to_zendesk() method to application controller; used by feedback and user callback controllers
Merge pull request #406 from ministryofjustice/add-flash-to-confirmation

Render flash on confirmation page
Start of the applicable statements for Tenancy

This is just the start of the ticket:
https://www.pivotaltracker.com/story/show/75880916

Somebody needs to pick it up and complete the rest.
Added validation for single tenancy agreement

The logic is that if there is a one tenancy agreement, one applicable
option has to be picked.