Use integrity-protected=no to explicit request Sprout to authorisation
Merge branch 'master' of github.com:Metaswitch/sprout into trusted_as
Fix merge conflicts
Fix merge issues
Change authentication in line with IMS model - only authenticate on REGISTER
Fix up UTs
Fix merge issues
Fix further merge issue
Fix up UT breakages - script inaccuracy causing failures now authentication looks at SIP identity
Code review mark-ups
Merge pull request #58 from Metaswitch/trusted_as

[Reviewer Keith] Trusted as