Merge pull request #1 from kaushik84/master

first commit: my qpsk demod block added
examples: added examples for tutorial 7.
misc: some general fixups.
restructured examples directory to have subdirs for each tutorial.
tut7: added post images
tut7: initial commit of existing images
tut7: initial commit of current GRC flowgraphs
tut6: Updating first half of flowgraphs and images with Qt stuff
tut6: deleting unused image
tut6: pushing files for the 'simple spec an'
tut6: Pushing materials for broadcast FM RX
tut6: not sure why these two images are broken...
tut6: trying to re-add these images
tutorial5: Added examples
Added LICENCE file (for gr_modtool)
fixed copyright headers
removed diff, simplified algorithm
Added chat blocks
CMake uses globs for grc examples
Added chat app example