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
spike other pages too
Merge pull request #412 from ministryofjustice/error_pages

Error pages
Fixed error message copy and sequencing
Merge pull request #413 from ministryofjustice/hmo_error_message

Fixed error message copy and sequencing
Merge branch 'master' into header_and_footer