Idl-frontend-cpp to allow including C++ headers from interfaces.
Fix dependencies configuration to include idl-frontend-cpp.
Fixed conflict in:
	pom.xml
Fix Travis where I forgot to tell to build idl-frontend-cpp.
Fix licences
Fix idl-frontend-cpp version for NMF-Style
Merge pull request #26 from StephaneSeyvoz/nmf-style

Idl-frontend-cpp to allow including C++ headers from interfaces.
Cherry-picked commits from the "frontend" branch of "master" + version fix.