Add buffer support#50

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valpackett wants to merge 5 commits intodberesford:masterfrom

valpackett:master

Commits on Jun 5, 2017

Add buffer support (fixes #21)
valpackett
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Commits on Jul 5, 2017

Fix preview being cut off
valpackett
committed

Commits on Aug 4, 2017

Fix require example in readme
valpackett
authored

Commits on Jul 5, 2018

Update nan
valpackett
committed

Commits on Aug 24, 2019

Fix build with node 12, fixes #3
valpackett
committed