Constraints change and a small facelift#3

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DmitryDodzin wants to merge 3 commits intoval-grasley:masterfrom

DmitryDodzin:master

Commits on Jul 2, 2017

Adding the ability to change the navigator.getUserMedia constraints
DmitryDodzin
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Changed to dependency after reading https://github.com/facebook/prop-types#how-to-depend-on-this-package
DmitryDodzin
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Converted the player to a class
DmitryDodzin
committed