Honour /etc/clearwater/config settings for Sprout's S-CSCF port
Merge pull request #24 from Metaswitch/configurable_scscf_port

[Reviewer: Matt] Honour /etc/clearwater/config settings for Sprout's S-CSCF port
Poll homestead correctly
Merge pull request #26 from Metaswitch/homestead-poll

[Reviewer: Mike] Poll homestead correctly
Updates to cpp-common
Merge pull request #28 from Metaswitch/submodule_update

[No reviewer] Updates to cpp-common
Give homestead ownership of log directory when it already exists
Merge pull request #29 from Metaswitch/log_directory_permissions

Give homestead ownership of log directory when it already exists
Merge pull request #25 from Metaswitch/sto635

sto635 - SAR deregistration support
HSS interop fixes
Take latest submodules
Merge pull request #31 from Metaswitch/hss-interop

[DON'T MERGE] [Reviewer: Andy] HSS interop fixes
Bracket IPv6 addresses in Server-Name field
Merge pull request #34 from Metaswitch/bracket-ipv6-in-server-name

[Reviewer: Mike] Bracket IPv6 addresses in Server-Name field
Add digest/av handler uts. Add comments to handler uts. Fill in a few gaps in handlers uts.
Merge latest master in to my branch
use new version of cpp-common