US903 - handles old cookies. Added to Claim forms.
US903 - Handling error in forms.
US903 - Filtered CSRFIlter out for tests.
US903 - replace Play CSRF filter framework with DWP one. Original code adapted so does not activate CSRF in test mode and present a proper error page when CSRF check fails.
Merge branch 'integration' into US903

Conflicts:
	c3/app/views/s11_consent_and_declaration/g4_declaration.scala.html
	c3/app/views/s11_consent_and_declaration/g5_submit.scala.html
US903 - removed references to play.filters. In applicaiton mode we do not need a signed (encrypted) csrf token.
US903 - removed usage sys.error.
US903 - moved CSRF code to CarersCommon.
US903 - updated logging.
US903 - added hidden CSRFG to async page.
US903 - Fixed all claims.
Merge branch 'integration' into US903