Support multiple surrogate optima

[Balaji Pokuri]

find_next_query_point() for n_surrogate_opt > 1 case

[Alec Lofquist]

The only hard part about this is that the acquisition function needs to avoid points that have already been found. I don't want to add them to the pending list, since "pending" means the point has already been fed into the cost function at least once (to e.g. start a job). Will work on it more tomorrow.

[Alec Lofquist]

Fix #6 (support for multiple surrogate optima)

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