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
Don't send session data to AppSignal
Merge pull request #410 from ministryofjustice/app_signal_4

Don't send session data to AppSignal
Updated copy to yes / no question re attending court 

As per ticket https://www.pivotaltracker.com/story/show/75883250