New file to write documentation for development
The System.Json library is referenced
Added the reference to System.Json
Changes to return the confidence of a prediction

An example of usage is added too.
A new class to wrap interesting information of a node

inside an object can be stored the useful information
of a node in each prediction step
adding an example of use of new model's expression
Adding the "not equal" condition

removing duplicated method that is unuseful
expression of the model with an object for each node
method that use the model in each node
new class ResultNode included in the project
override the toString method for ResultNode class
Better names for vars
ToString method added for Sources
Private is not a postable parameter
HoldOut is a deprecated parameter
Merge pull request #1 from joseribes/master

Confidence in the result. Adaptation to the new API version