Add optional intensity parameter for surfaces#314

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mikolalysenko wants to merge 10 commits intoplotly:masterfrom

mikolalysenko:surface-intensity

Commits on Mar 3, 2016

Merge remote-tracking branch 'upstream/master'
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Commits on Mar 4, 2016

Add surface intensity parameter
mikolalysenko
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Commits on Mar 10, 2016

Commits on Mar 11, 2016

add baseline image for surface intensity test
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Commits on Mar 15, 2016

Commits on Mar 16, 2016