Improve cosmology use

See #239 (closed)

This generalises the cosmology in the conversion module using astropy.cosmology.

TODO:

• Make the UniformComovingVolume prior use an arbitrary cosmology.
• Decide on a way to set a specific cosmology in the module.

@cjhaster if you have any comments or requests, feel free.

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• 6d836700 - Merge branch 'master' into improve_cosmology_use
• ec6084e0 - update uniform comoving volume prior

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• 3032f877 - fix refernce to cosmology
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• cb59db38 - extend UniformComovingVolume prior to enable comoving distance and redshift

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• 9f151255 - remove comoving distance from UniformComovingVolume
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• 262bc231 - add methods to convert between dl and z

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• 70282789 - move cosmology stuff to its own module

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• f386cb5b - flake fixes

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• cbaaf006 - Merge branch 'master' into improve_cosmology_use

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marked the checklist item Decide on a way to set a specific cosmology in the module. as completed

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• 8d6599e7 - add cosmology dictionary testing
• ea3121d7 - tidy up cosmology get function
• 91f18bca - Fix BNS spins
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• 8a6dd0d6 - flake/python 2 compatibility

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• a1ced8bd - fix getting cosmology

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• 95b06331 - change __max/__min to _max/_min
• edec2a50 - update tests
• 266b5e2e - introduce Cosmological prior which UCV subclasses

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• a73d46b0 - fix unit in UCV prior

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