build drake w/ eigen (=> most of our mex files) on windows

holy hell, that was a lot of work.  but here is it.  please help me review it very carefully!

went to make this change, and realized that INF isn't actually being used here.  So just zapped it completely.

On Sep 21, 2014, at 12:19 AM, Hongkai Dai <notifications@github.com> wrote:

> In systems/plants/constructModelmex.cpp:
> 
> > @@ -4,28 +4,16 @@
> >  #include "drakeUtil.h"
> >  #include "RigidBodyManipulator.h"
> >  #include <stdexcept>
> > -#include "joints/drakeJointUtil.h"
> > +
> > +#if !defined(WIN32) && !defined(WIN64)
> > +  #include "joints/drakeJointUtil.h"
> > +#endif
> >  
> >  #define INF -2147483648
> Shall we delete this and use numeric_limits instead?
> 
> —
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