Allow emcee to work with pre-release versions

The release version of emcee (2.2.1) is over two years old, however there are a couple of more recent pre-releases available on PyPI. These releases change the names of a few arguments, so in this PR I've made some changes that should allow the use of these newer versions of emcee.

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• c4eb8db7 - emcee.py: some re-factoring to try and get the tests to work

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• 9357d52b - Remove blank lines with whitespace

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• f4541d32 - Update emcee.py: slight fix in case passing newer argument names as keywords

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• e9ff33cc - Remove whitespace

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approved this merge request

Since it is passing the tests this maintains backward compatibility I see. Nice :)

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approved this merge request

mentioned in commit e09ad0d4

merged