some adjustments for the shader chapter#202

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tpltnt wants to merge 18 commits intoopenframeworks:masterfrom

tpltnt:shaders-editing

Commits on Mar 29, 2016

adjusted headings
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updated glossary
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introduction done
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3d -> 3D
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OF -> oF
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removed dot for consistency
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rephrased vertex intro
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split long sentence in shorter ones
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split long fragment shader sentence in shorter ones
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added GLSL to glossary
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added GLSL wikipedia link
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oF -> openFrameworks
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added missing 'the'
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added alt text to youtube link
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Commits on Apr 13, 2016

Merge branch 'master' into shaders-editing
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Commits on Apr 17, 2016

Merge branch 'master' into shaders-editing
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removed mentioning of indexes to simplify explanation of draw()
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Commits on May 25, 2016

Merge branch 'master' into shaders-editing
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