++++++++++++++++++
- 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>`_)