Fuzzification and defuzzification functions

Nebular has a few more functions now. Besides the already released membership functions (see older posts for a complete list) there are now some defuzzification functions.

At moment we have the centroid and the bisector defuzzification functions, being centroid the most used one. We will write maxima functions next week.

After that we will add some more documentation and examples and probably will submit a patch to Apache Commons Functor to some parts of the Range and Functions API.

There is also a crisp membership function that will be included in nebular. So stay tuned, we plan to release a new version soon.