k-Means Euclidean
1.Euclidean distance
2.Weighted Euclidean distance <script src="http://gist.github.com/255052.js?file=rgb_lab_euclidean.cpp"></script>
2.Weighted Euclidean distance <script src="http://gist.github.com/255052.js?file=rgb_lab_euclidean.cpp"></script>
