DOC: update optimize tutorial
DOC: update optimize tutorial

Merge pull request #152 from dlaxalde:doc/optimize/tutorial
  DOC: mention that Rosenbrock function is implemented in optimize
  DOC: fix rosen_hess definition in optimize tutorial
  DOC: use minimize in SLSQP tutorial and simplify it
  DOC: use minimize in unconstrained minimization tutorial
  DOC: review introduction list in optimize tutorial

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