Added Demo 14
Demo 14, Code cleanup, enhanced demo 3

Cleanup:
  Removed hard-to-maintain comment headers, added README.txt
  Replaced gluLookAt with glTranslated
  Renamed "depth" to "z"
  Demo3 now includes ifdefs to illustrate right/left handed coordinates.

Demo 14:
  Now using vmath.h from OpengGL.
  (Not sure of license, so leaving it external)
    Changed doubles to floats for use with vmath.h
  Reproduced functionality of Demo 12, using shader programs.