first bit of fractions. not complete
remove extra xs. and collapse fractions into integers when we can on output
format fraction strings with optionally no leading + sign, for exponents
use special string formatting for exponents
fix zero comparison on exponent. format long term creation
create fractional random terms similarly to how we did the old ones. make displaying and creating fractions optional on the command line
a bit of divide by zero protection
leave the zero terms in the polynomials
Merge branch 'master' into fractions
Merge branch 'master' into fractions
merge from sort_terms and fix sorting order
fix unit tests to use fractions
Merge branch 'master' into fractions

Conflicts:
	src/com/swtanalytics/math/MathFunction.java
Merge pull request #10 from stepthom/fractions

Fractions