Make the list of supported Cx vendor IDs configurable (but default to the spec-defined value)
Return nice 503 error when Cassandra times out
Merge pull request #118 from Metaswitch/issue117

[Reviewer: Andy] Make the list of supported Cx vendor IDs configurable
Fix typo
Improve HSS interop - use correct vendor IDs and fix host IP address
Back out superfluous change
Merge pull request #121 from Metaswitch/hss_interop_fixes

[Reviewer: Andy] Improve HSS interop - use correct vendor IDs and fix host IP address
Update sdp
Merge pull request #120 from Metaswitch/cass-timeout

[Reviewer: Alex] Return nice 503 error when Cassandra times out
Use ServerAssignmentType UNREGISTERED rather than NO_ASSIGNMENT when no IPMI available
Fix UT
Merge pull request #122 from Metaswitch/server_assignment_unregistered

[Reviewer: Mike] Use Server-Assignment-Type UNREGISTERED rather than NO_ASSIGNMENT when no IMPI available
Improve HSS interop
Fix UT
Code review mark-ups
Merge pull request #123 from Metaswitch/hss-interop

[Reviewer: Andy] Improve HSS interop
Sprout port is 5054, not 5058
Merge pull request #125 from Metaswitch/sprout-5054

[Reviewer: Rob] Sprout port is 5054, not 5058
Cx is an authentication application, not an accounting one
Fix HSS interop - homestead wouldn't start with an HSS