Removed 'Optimization_Example.java':

I used this file to learn how to use apache commons math.
Implemented a polynomial 2D fit with LMA.java:

I found out why my last implementation didn't work and made a new one.
Now I can remove LM.java from EFTEMj.
Restructured files containing to LMA.java:

There is a new package called 'libs'.
'lma' is placed at this package. I added all missing files from zip.
I attached the zip-file as resource.
Removed LM.java and LM_Function.java:

The simple implementation of Levenberg–Marquardt algorithm is no longer
necessary.
I had to modify Polynomial_2D.java as it implemented LM_Function.
Merge branch 'remove_unnecessary_files'