touched up floating point conversions
added invert() implementation comparison
made add an instance method
added add implementation comparison
made multiply an instance method
benchmark says simpler multiply is better
made subtract an instance method
added multiply BigInteger and int ICTs
made divide an instance method
added divide(Rational) ICT
added divide(BigInteger) and (int) ICTs
cleaned up properties, added harmonicNumber props
added pow ICT
finished cleaning up Rational docs
added shiftLeft and shiftRight ICTs
added continued fraction test
added continuedFraction properties
fixed read and added findIn
simplified some Rational methods
started RationalVector class