Changes to build-makefile and clean-all in client and clean-all in counter to support building on multiple OSs and added comments to counter.cpp
Added a checkerboard Qt example that displays a checkerboard
Added a clickable checkerboard to qt-examples.

This example doesn't work right now. The goal is that the squares in the checkerboard will change color when you click them.
Merging in visual branch.

Added checkboard and clickableCheckerboard (doesn't work) folders to qt-examples.

Small changes to counter.