Redirect the user back from AD form once done

Redirect the user back to the URL (s)he came from once they fill in the
AD form.
Redirect back to origin & flash, but not for feedback

After completing the request, take the user back to the page they
originated from and flash the message. But if the user came back from
the feedback form message, still return them back but don't flash the
message.
Merge pull request #403 from ministryofjustice/75795626-remember-where-user-came-from

Redirect the user back from AD form once done
claim action should set a session

It should set it to itself so that if the user goes to the technical
help page, it should return the user to the confirmation page.

Redirect the user when requesting tech help

But don't redirect them back to the tech help form or the feedback form.
renamed variable
unit tests for redirect from technical help form submission
implemented redirect in
feedback controller
refactoring: created return_to() method
added referrer_is_feedback_form?()
removed unneeded code
Merge pull request #404 from ministryofjustice/redirect_to-ad-form

Redirect to ad form
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
spike using relative links in 500 page
Updated copy to yes / no question re attending court 

As per ticket https://www.pivotaltracker.com/story/show/75883250
Merge pull request #411 from ministryofjustice/Test_Leigh

Updated copy to yes / no question re attending court