Added imencode#8

Open

pdpotter wants to merge 3 commits intocodeboost:masterfrom

pdpotter:master

Commits on Jan 17, 2013

Added imencode
pdpotter
committed

Commits on Feb 14, 2013

Rewrote imdecode as manual function to work with Node::Buffer
pdpotter
committed
Revert "Rewrote imdecode as manual function to work with Node::Buffer"
pdpotter
committed