Merge pull request #1 from pradal/master

PLY codec
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Merge pull request #3 from pradal/master

VTK reader for ascii and binary
Merge pull request #2 from tomriddle1234/patch-1

Update README.rst
Update README.rst

Enhance
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Merge pull request #4 from pradal/master

Export VTK exported mesh to PlantGL
Update autosum.rst
Update index.rst
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Merge pull request #5 from pradal/master

MTG computation from segmentation - stage 1
Merge pull request #6 from pradal/master

Segment the stem and add light computation