Triangles in chapter 2, exercise 4 are now wound in anti-clockwise fa…

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Hi there,

Thanks very much for the OpenGL tutorial! The last time I touched OpenGL it was version 1.2!

I had some trouble continuing on from the tutorial with textures being flipped. It turned out that I had the incorrect winding for the triangles. I remembered anti-clockwise from v1.2 but assumed that it had changed when I saw clockwise in the tutorial.

I can go through and change the rest of the example code and articles if it helps.

Thanks again for a superb tutorial!