Get return code from HSS
Comment update
Merge branch 'master' of github.com:Metaswitch/sprout into iss401

Conflicts:
	include/hssconnection.h
	sprout/ut/hssconnection_test.cpp
Update longs to HTTPCode
Merge pull request #429 from Metaswitch/iss401

[Reviewer: Rob] Iss401
Merge branch 'master' of github.com:Metaswitch/sprout into sto640
Updates after review