Perform NAT-aware REGISTER
Merge pull request #33 from Metaswitch/perimeta-support

Reviewer Mike - Perform NAT-aware REGISTER
Test SIP MESSAGE support
Don't run SIP MESSAGE tests with udp
Correct name and ruby style
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Merge pull request #34 from Metaswitch/sip_message_support

[Reviewer: Rob] Sip message support
Add P-Visited-Network-Id headers to the live tests
Combine headers in same if block
Merge pull request #35 from Metaswitch/p-visited-network-id

[Reviewer: Rob] Add P-Visited-Network-Id headers to the live tests