Update to commons-math3-3.2

I found your example to be very clear, and that is encouraged me to write my own extension for ruby-processing.  In the meantime I found out that headius is now pointing people in direction of James Coglan as an example for writing an extension (no separate service class). Somewhere I read something by headius along the lines that a separate service class is now unofficially deprecated? Anyway I am having no luck on jruby forum, but I've gone to the effort of converting the fraction class anyway (no longer relevant since ruby-2.1.0 though, but I also include a  possible fastmath). By the way I don't really expect you to merge.