node support
add tests for node
readme notes
Add ability to use buffers
Merge pull request #1 from piscis/master

Add ability to use buffers
Fix variable leak
Add component.json, for component.io usage
Expose low-level functions which does not clean up the canvas

Useful to re-use the canvas instance in further image analysis
with other libraries/methods.
TEMP: use jonnor/color-thief in component.json while pull request is pending