Added new test

git-svn-id: http://lire.googlecode.com/svn/trunk@170 f280a053-6817-128d-8a7e-cdf98506035a
Added explanatory error messages to K-Means.

git-svn-id: http://lire.googlecode.com/svn/trunk@171 f280a053-6817-128d-8a7e-cdf98506035a