Speed up Geometry.build() by a large factor when loading from cache.

A bunch of small tricks have been applied to reduce the amount of time
required to build an already cached geometry:

  * Replace uses of fromiter() on long sequences with code that operates
    on bigger arrays.
  * Use memoization on the Solids to more efficiently map materials
    to material codes when a solid is repeated (as is the case in all
    our detectors)
  * Use numpy.take() instead of fancy indexing on big arrays.  I
    learned about this trick from:
        http://wesmckinney.com/blog/?p=215

Also, switched over to compressed npz files for storing cache information.
They take the same size as the gzipped pickle files, but load 30% faster.

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