Update some documentation

[grits] / HACKING

diff --git a/HACKING b/HACKING
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+For Grits development:
+  - http://www.lug.rose-hulman.edu/proj/aweather/development
+
+For OpenGL programming:
+  - http://www.opengl.org/sdk/docs/man/
+  - http://www.glprogramming.com/red/
+  - http://www.glprogramming.com/blue/