allow one int of difference between js and c++ rgb comparision - fixes a few tests after 830e99afdce7485f8a3aee1ed1a145220109faaa
allow one int of difference between js and c++ rgb comparision - fixes a few tests after 830e99afdce7485f8a3aee1ed1a145220109faaa

mapbox/node-blend,KyleAMathews/node-blend