update in prep for new OpenGL specs
use 1.0 for NeHe tuts
image.jl is now Images.jl (a separate package)
tut6 should use OpenGLver 1.0 and proper Images.jl format
missed one .data reference for img3D in tut6
testing new glimread function
receive img width and height to pass to GL texture routines
switch to new glimread
massive renaming to be consistent with official OpenGL and SDL specs
lots of renaming & cleanup, README update
fix typo in tut17, cleanup REQUIRE