Merge pull request #2 from kaushik84/master

tutorial4: relocating files to examples/tutorial4
added tutorial 2 files
Chat App now uses my qpsk demod
Fixed QA and XML bindings
minor bug fixes (XML and gray code disabled output)
argh, actually fixed that xml instead of breaking it
added tagged version of qpsk demod
Review of Tutorial7
Merge pull request #3 from kaushik84/master

qa test code for my qpsk module added
Changes merged for CMakefiles and xml files