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New Features
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- Added a new potential class for the Satoh density (Satoh 1980).
- Added support for Leapfrog integration when generating mock stellar streams.
- Added new colormaps and defaults for the matplotlib style.
- Added support for non-inertial reference frames and implemented a constant
rotating reference frame.
- Added a new class - ``Hamiltonian`` - for storing potentials with reference
frames. This should be used for easy orbit integration instead of the
potential classes.
- Added a new argument to the mock stream generation functions t output orbits
of all of the mock stream star particles to an HDF5 file.
- Cleaned up and simplified the process of subclassing a C-implemented
gravitational potential.
- Gravitational potential class instances can now be composed by just adding the
instances.
- Added a ``MilkyWayPotential`` class.
API-breaking changes
--------------------
- ``CartesianPhaseSpacePosition`` and ``CartesianOrbit`` are deprecated. Use
``PhaseSpacePosition`` and ``Orbit`` with a Cartesian representation instead.
- Overhauled the storage of position and velocity information on
``PhaseSpacePosition`` and ``Orbit`` classes. This uses new features in
Astropy 2.0 that allow attaching "differential" classes to representation
classes for storing velocity information. ``.pos`` and ``.vel`` no longer
point to arrays of Cartesian coordinates, but now instead point to
astropy.coordinates representation and differential objects, respectively.