validate deliver up possession is checked
show deliver up possession validation error message in form
CSS fixup
Merge pull request #73 from ministryofjustice/deliver_up_possession_must_be_checked

Deliver up possession must be checked
layout and copy changes to claimant section
Merge pull request #74 from ministryofjustice/claimant_section_alterations

Layout and copy changes to claimant section