Adding light position configurability for `surface` and `mesh3d`, and general lighting configurability for the latter#556

Merged

etpinard merged 10 commits intoplotly:masterfrom

monfera:fix-brain

May 26, 2016

Commits on May 26, 2016

Adding epsilon configuration in order to pass it on to newly modified dependencies that now take these new params. The default values are set such that 3D mesh models with minute triangles are also…
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Adding light source configurability
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Adding attribute documentation
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Updated complex `mesh3d` images (unnoticable change except for the vastly improved Snowden head)
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Test: mesh color, ambient reflection and diffuse reflection parameters. Not covered: specular and its constituent parameters.
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Test: directional light position and camera attributes up, center and eye
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Test case changed for a surface3d image
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Make vertexnormalsepsilon and facenormalsepsilon specific to mesh3d
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Test case changed for a surface3d image
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Minor image updates (some of them reversals)
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