It should be trivial to run several tests at once using Parallel Python or
something else. py.test offers such a feature already, so maybe we should
use it instead of a own solution.

Original issue for #99: http://code.google.com/p/mpmath/issues/detail?id=59

Original author: https://code.google.com/u/[email protected]/

Original owner: https://code.google.com/u/[email protected]/