**API changes:**
- The API of `mcmc_lc` has changed significantly (the function was marked
experimental in previous release).
- **[DEPRECATION]** In result of `fit_lc`, `res.cov_names` changed to
`res.vparam_names`.
- **[DEPRECATION]** In result of `nest_lc`, `res.param_names` changed to
`res.vparam_names`. This is for compatibility between the results of `fit_lc`
and `nest_lc`. [30]
- **[DEPRECATION]** Deprecate `flatten` keyword argument in `fit_lc()` in
favor of explicit use of `flatten_result()` function.
**Enhancements:**
- Many new built-in models.
- Many new built-in bandpasses.
- New remote data fetching system. [73]
- SALT2 model covariance available via `Model.bandfluxcov()` method and
`modelcov=True` keyword argument passed to `fit_lc`.
- New simulation function, `zdist`, generates a distribution of redshifts
given a volumetric rate function and cosmology.
- New simulation function, `realize_lcs`, simulates light curve data given a
model, parameters, and observations.
- Add color-related keyword arguments to `plot_lc()`.
- Add `tighten_ylim` keyword argument to `plot_lc()`.
- Add `chisq()` function and use internally in `fit_lc()`.
- Add `SFD98Map` class for dealing with SFD (1998) dust maps persistently so
that the underlying FITS files are opened only once.
- Update `get_ebv_from_map()` to work with new SkyCoord class in
`astropy.coordinates` available in astropy v0.3 onward. Previously, this
function did not work with astropy v0.4.x (where older coordinates classes
had been removed).
- Update to new configuration system available in astropy v0.4 onward.
This makes this release incompatible with astropy versions less than
0.4.
- Now compatible with Python 3.
- Increased test coverage.
- Numerous minor bugfixes.