Complete .NET IEquatable implementation reference

I finally wrote a sample code that shows the correct way to implement all IEquatable related methods:

https://github.com/JaderDias/iequatable-implementation-reference/blob/master/IEquatableReference/trunk/IEquatableReference/ValuesClass.cs

The unit tests that justify each line of code are there:

https://github.com/JaderDias/iequatable-implementation-reference/blob/master/IEquatableReference/trunk/IEquatableReferenceTest/ValuesClassTest.cs