Added: 
	ClosureClass:
		Abstract class, describing the essence of closure classes.
	ClosureClasses:
		Closure classes factory and implementation of T0, T1 and S closure
classes.
	Test5:
		Test unit for closure classes.
	JPolynomConverter:
		Future Zhygalkin's polynom implementation.
Merge pull request #2 from aivel/sem

Merge pull request from Max