Created "plastic" and "painted_plastic" shaders#151

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eestrada wants to merge 5 commits intoAcademySoftwareFoundation:mainfrom

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Commits on Apr 24, 2012

Created plastic.osl and paintedplastic.osl example shaders.
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Commits on Sep 14, 2012

Merge https://github.com/imageworks/OpenShadingLanguage
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Commits on Oct 22, 2012

Merge branch 'master' of https://github.com/imageworks/OpenShadingLanguage
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Commits on Mar 13, 2013

Merge branch 'master' of git://github.com/imageworks/OpenShadingLanguage
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Commits on Dec 28, 2013

Merge branch 'master' of git://github.com/imageworks/OpenShadingLanguage
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