New method for realistic correlation matrices generation

[aivuk]

Implement the method described in:

https://projecteuclid.org/euclid.aoas/1380804814
http://arxiv-web3.library.cornell.edu/abs/1106.5834v1

The implementation is easy and I had some interesting results with a Python version that I coded. Or we can fork the code from:

http://pages.pomona.edu/~jsh04747/research/simcor.r

removing the examples and writing the code in the Morphometric package conventions.