Added an additional node function called getPixelColor(). Currently not very optimized, but seems fast enough for CLI work.
Added test for getPixelColor() to show usage; pixel color/alpha values now show up as 0-255 instead of 0-65535; fixed error message reporting the wrong method name.
getPixelColor renamed to getConstPixels to return array of pixel values in provided area.
Added quantumDepth()
README about getConstPixels, version, quantumDepth
Merge pull request #37 from mash/getconstpixels

Add image.getConstPixels API