Merge pull request #499 from memmett/ahmadia/hpc3_2014_stack

pyboxlib: Use distutils and bump upstream version.
Merge pull request #500 from memmett/ahmadia/hpc3_2014_stack

PyBoxLib: Bump upstream.
Merge pull request #501 from memmett/ahmadia/hpc3_2014_stack

PyBoxLib: Use github mirror.
PyBoxLib: Switch to F90 version of BoxLib.