Invalidate cached message info whenever we manually change the response code
Switch to using rapidjson in ChronosConnection
Merge pull request #557 from Metaswitch/issue456

[Reviewer: Mike] Invalidate cached message info whenever we manually change the response code
Take latest cpp-common
Merge pull request #558 from Metaswitch/chronos_rapidjson

[Reviewer: Andy][From: Alex] Switch to using rapidjson in ChronosConnection
Add UT for homestead issue 94
Merge pull request #561 from Metaswitch/homestead-issue94

[Reviewer: Mike] Add UT for homestead issue 94
Updates after test
Merge branch 'dev' of github.com:Metaswitch/sprout into sto382_em