Exoplanet

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- Adds support for testing using tox (`197 <https://github.com/exoplanet-dev/exoplanet/pull/197>`_)
- Updates documentation, tutorials, and case studies for JOSS review (`186 <https://github.com/exoplanet-dev/exoplanet/pull/186>`_ and `#200 <https://github.com/exoplanet-dev/exoplanet/pull/200>`_)

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- Adds high-level, pure-Theano/Aesara implementation of ``RegularGridInterpolator`` to replace compiled version (`167 <https://github.com/exoplanet-dev/exoplanet/pull/167>`_)
- Moves compiled Ops to `exoplanet-core <https://github.com/exoplanet-dev/exoplanet-core>`_ making exoplanet a pure-Python package (`#171 <https://github.com/exoplanet-dev/exoplanet/pull/171>`_)
- Moves `ReboundOp` and `ReboundOrbit` to `rebound-pymc3 <https://github.com/exoplanet-dev/rebound-pymc3>`_ (`#166 <https://github.com/exoplanet-dev/exoplanet/pull/166>`_)
- Removes deprecated submodules (``gp``, ``optimize``, and ``sampling``) and base distributions (e.g. ``xo.Angle``) (`165 <https://github.com/exoplanet-dev/exoplanet/pull/165>`_)

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- Adds support for recent versions of PyMC3 built on Aesara (`150 <https://github.com/exoplanet-dev/exoplanet/pull/150>`_)
- Fixes bug in `SimpleTransitOrbit` contact point calculation (`148 <https://github.com/exoplanet-dev/exoplanet/pull/148>`_)

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- Adds support for relativistic orbits using REBOUNDx (`98 <https://github.com/exoplanet-dev/exoplanet/pull/98>`_)

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- Adds support for PyMC3 v3.10 and Theano-pymc

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- Fixes issue with automatic execution of tutorials