0.2.1	- initial R version

0.2.2	- added object Assignment
	    - added string.BooleanFunction

0.2.3	- added object Polynomial
        
0.2.4   - added method BooleanFunction::ANF (returns Polynomial)

0.2.5   - removed hashCode()
        - added operators [[, +, * for Polynomial
        - sorted monomials in Polynomial::string()

0.2.6   - started testing with package RUnit

