Make somme fixes:

Added c++ headers in the project Makefile
	modified:   Makefile

Remove some duplicated entry in examples/Makefile
	modified:   examples/Makefile

Some fixes done here.
	modified:   examples/rdkafka_example.cpp

Updated some not-C++ compilant code
	modified:   rdaddr.h

	renamed:    c++/rdkafka.h -> rdkafkacpp.h