Handle reREGISTER requests containing a challenge response
Don't run Timer C on non-INVITE transactions
Take latest cpp-common
Merge pull request #860 from Metaswitch/issue832

[Reviewer Andy] Don't run Timer C on non-INVITE transactions
Code review feedback
Merge pull request #859 from Metaswitch/issue833

[Reviewer Alex] Handle reREGISTER requests containing a challenge response
Merge remote-tracking branch 'origin/dev' into ifc-sas-compression