0.1.0 - Apr. 04/07
  * ID3 algorithms for continuous and discrete cases
  * Graphviz component to visualize the learned tree

0.2.0 - Jul. 07/07
  * Modified and improved by Jose Ignacio (joseignacio.fernandez@gmail.com)
  * Added support for multiple, and symbolic outputs and graphing of continuos trees.
  * Modified to return the default value when no branches are suitable for the input.
  * Refactored entropy code.