Added cosmocode modules
Merge pull request #26 from BenediktDiemer/develop

Added cosmocode modules
Merging Benedikt's cosmology sub-package into the repo.

Merge remote-tracking branch 'upstream/develop' into develop
Re-implemented retrieve_catalog_filenames now that Yale permissions are updated
Removed obsolete retrieve_particles method from particles class
Removed obsolete read_nbody.particles class
Removed obsolete simulation object from read_nbody
Removed obsolete Config object and deleted calls to, and tests of, this object
Modified docstrings