Create add_pcfa_header method
Corrections to add_pcfa_header function
Parse and return charging addresses from HSS responses
Add a PCFA header in appropriate locations in the code
Change 5xx to 503
Merge pull request #769 from Metaswitch/iss767

[Reviewer: Mike] Change 5xx to 503
Unit tests for charging addresses
Timer C support
Route to Sproutlets based on ReqURI (except for REGISTER/SUBSCRIBE)
Remove unnecessary #include
Merge pull request #773 from Metaswitch/route-on-requri

Reviewer Alex - Route to Sproutlets based on ReqURI (except for REGISTER/SUBSCRIBE)
Use order dependencies for PHONY targets
Merge pull request #633 from Metaswitch/allow-parallel-builds

Reviewer Alex - Use order dependencies for PHONY targets
Code review feedback
Merge pull request #772 from Metaswitch/issue436

[Reviewer Andy] Timer C support
Return stale=true if authentication fails because AV not found
Always consider an ACK transaction to be complete even if a sproutlet does not forward it
Update UTs to check stale parameter
Update stale parameter for digest auth as well
Fix typo