Added a quickly create group function.

2.6.1

Updated README.

Refactored structure and added more functions.

2.6.0

Updated v2.6.0

Updated random method.

2.5.3

Updated v2.5.3

Added kernel of RBF.

2.5.2

Added Kernel of RBF.

Fixed a bug.

2.5.1

Fixed a bug.

Updated algorithm and added automatic clustering methods.

Updated V2.5.0

Added automatic clustering patterns and saved the trained centers into
NSUserDefault.

Fixed a distance bug.

2.4.1

Fixed a distance bug.

Added Euclidean Multi-Dimensional.

This method not better than Cosine Similarity.

Fixed bugs.

Updated V2.3.1.

Added Multi-Demensional clustering.

A basic multi-demensional method named Cosine Similarity method, maybe next is implement kernel functions.