Initial commit

A Qt version of the ogl2brick-2.0 demo code provided with the OpenGL
Shading Language 2nd edition.
Copy shader files to build directories

Add INSTALLS entry to the qmake project file to copy brick.frag and
brick.vert to the output directories for release and debug builds.
Add Z dimension to the brick shader

My changes to add a Z dimension to the brick shader as suggested in
section 6.4 of the orange book, so that mortar appears between the
bricks along Z as well as X and Y.
Merge branch 'master' of https://github.com/edlangley/brick-qt
Updated README