Exoplanet

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- Fixes pickling error when sampling in parallel (`120 <https://github.com/exoplanet-dev/exoplanet/pull/120>`_)

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- Adds faster solver for Kepler's equation
- Improves automation of documentation and release process
- Removes most C++ Ops and replaces them with pre-compiled functions which allows the distribution of binary wheels
- Removes ``gp`` submodule; moved to new `celerite2 <https://celerite2.readthedocs.io>`_ package
- Deprecates some non-exoplanet-specific functions and distributions; moved to `pymc3-ext <https://github.com/exoplanet-dev/pymc3-ext>`_ package

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- Fixes compatibility with PyMC3 version 3.9

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- Fixes a documentation bug introduced in v0.3.1

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- Adds support for light travel time when computing positions in Keplerian orbits
- Adds ``SecondaryEclipseLightCurve`` for modeling eclipsing binaries
- Adds ``UnitDisk`` distribution for fitting eccentricity vectors

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- Adds tests and support for Windows
- Adds a "Jacobian" interface to the orbit objects for reparameterization