Wrong color assignment in Tutorial 05 source codes

[paroj]

Originally reported by: Sand3r (Bitbucket: Sand3r, GitHub: Sand3r)

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In all .cpp files coming from Tutorial 05, the assignment of colors for blue and green is incorrect, and should be swapped.

Side note: It may seem to be minor bug, but it greatly confused me when I was playing with the code to gain better understanding of indexed buffering.

#define GREEN_COLOR 0.75f, 0.75f, 1.0f, 1.0f
#define BLUE_COLOR  0.0f, 0.5f, 0.0f, 1.0f

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• Bitbucket: https://bitbucket.org/alfonse/gltut/issue/124