Gaussian smoothing and new geometry densifier

[jgaffuri]

I have developed these two algos which might be interested to be included in jts-core:

• One to smooth geometries using a gaussian kernel
• An other (which is used by the previous) to densify a geometry using a strategy different than the one used in the current Densifier class. A called it "little thumbling" strategy.

This is my first pull to JTS - let me know if I do it properly !

Signed-off-by: jgaffuri jgaf@protonmail.com

[jgaffuri]

This relates to: https://gis.stackexchange.com/questions/326779/

[micycle1]

@jgaffuri I've incorporated your gaussian smoothing implementation into this computational geometry project.

[jgaffuri]

Great job ! Thank you for your interest.