Vaspol pmf logistic pmf

This PR is based off of #1 There are two implementations of probabilistic matrix factorization here:

1. The normal probabilistic matrix factorization
2. The logistic probabilistic matrix factorization
I just found out that I can specify the maximum number of iteration for suds, then I will have a series of RMSE for every input matrix and parameter pair.

Jie
> On Dec 10, 2014, at 12:09 PM, Vaspol Ruamviboonsuk <notifications@github.com> wrote:
> 
> In logistic_pmf.m <https://github.com/paivaspol/EECS545/pull/2#discussion-diff-21618268>:
> 
> > @@ -0,0 +1,127 @@
> > +function constrained_pmf(dataFileName, mapSparseData)
> LOL yeah i should nice catch!
> 
> —
> Reply to this email directly or view it on GitHub <https://github.com/paivaspol/EECS545/pull/2/files#r21618268>.
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