Added imencode#8

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pdpotter wants to merge 3 commits intocodeboost:masterfrom

pdpotter:master

Commits on Jan 17, 2013

Added imencode
Pieterjan De Potter
committed

Commits on Feb 14, 2013

Rewrote imdecode as manual function to work with Node::Buffer
Pieterjan De Potter
committed
Revert "Rewrote imdecode as manual function to work with Node::Buffer"
Pieterjan De Potter
committed