glmnet work

I've been working on the python glmnet for a couple weeks now.  Here's what i've accomplished:

  * Updated the fortran code to the most current from CRAN.
  * Added support for logistic regression.
  * Added cross validation code for choosing lambda.
  * Re-factored quite a lot.

I plan on continuing to expand, my next goal is to add support for poisson regression.

As a side note, I had trouble getting the setup.py you provided to work, so I have to come back to this at some point.