Create new virtual send method in Diameter::Stack
Merge remote-tracking branch 'origin/master' into mockdiameterstack

Conflicts:
	src/diameterstack.cpp
Changes for (homestead's) handlers UTs
Merge remote-tracking branch 'origin/master' into mockdiameterstack
Merge remote-tracking branch 'origin/master' into mockdiameterstack
Merge pull request #44 from Metaswitch/mockdiameterstack

Change diameterstack to allow mocking it out