Fix numopt.root docstring.
Change numpy version requirements.
Toy implementation of FZERO.

Testing various interpolation branches in Matlab's FZERO method using a
Python toy implementation.
Simplex method.

Implementation of simplex method. Two issues:

 > Simplex method could be factored better, maybe. All simplex logic is
   encapsulated in the Constraints object. This object might be too
   coarse of an abstraction.
 > Tests have lots of commented code, since Lagrange multiplier
   optimality checks currently fail (even though I know simplex returns the
   optimal vertex).