V1.2.1 Lalo Math Update

Now this library has a polynomial calculator! (with monomial's as well)

Stuff changed:

• Added LaloCloning.dll dependency (to clone)
• Added polynomial calc ( + , - , /, * )
• Added polycheckin.cs (to check if a string is an effective polynomial, validation)
• Added polynomial exception (a few cases inside Polynomial.cs class)
• Added a simple method extension to handle gracefulllyt LinkedDoubleCircularList.cs
• Added more methods to LinkedDoubleCircularList.cs

What happened with V1.1 and V1.2 ?, well, I forgot to do those updates on github, but they're on nuget so....