Merge pull request #8 from marker68/v1.0.beta

V1.0.beta
Merge pull request #9 from marker68/v1.0.beta

V1.0.beta
Merge pull request #10 from marker68/v1.0.beta

V1.0.beta
Merge branch 'v1.0.beta' of github:marker68/simple-k-means
Merge branch 'master' of github:marker68/simple-k-means
Merge pull request #11 from marker68/v1.0.beta

V1.0.beta
Merge branch 'v1.0.beta' of https://github.com/marker68/simple-k-means into v1.0.beta
fixed bugs