Rename forward_* to send_* and add create_response function
Typo
Merge pull request #5 from Metaswitch/rename-forward-to-send

Reviewer Mike - Rename forward_* to send_* and add create_response function
Use sip_common
Remove include
Merge pull request #6 from Metaswitch/common_update

[No reviewer] Use sip_common
Merge master in to svc_api branch
Fix failing UT