Pytest-astropy

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- Added ``pytest-astropy-header`` as a dependency.

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- Updates to ``pytest-remotedata``, ``pytest-doctestplus``, and
``pytest-openfiles``. [14]

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- Update ``pytest-remotedata`` to reflect new version. [12]

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- Explicitly pin ``pytest-arraydiff`` to version >= 0.1. [10]

- Update dependencies on ``pytest-doctestplus``, ``pytest-remotedata``, and
``pytest-openfiles`` to reflect recent releases. [11]

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- Remove dependency on ``pytest-mpl`` since it introduces a dependency on
``matplotlib``, which is not always desirable.

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- Update REAME. Use README as long description on PyPi. [7]

- Update dependency versions of Astropy-specific plugins.