Astropy-healpix

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- Healpix rangesearch cleanup [113]
- Update astropy-helpers to v2.0.8 [112]
- Rewrite core module in C to make ``healpix_to_lonlat`` and
``lonlat_to_healpix`` broadcastable over both pixel index and nside. [110]

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- Ensure .c files are included in tar file.

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- Remove OpenMP from astropy-healpix [108]
- Fix bilinear interpolation of invalid values [106]
- Add uniq to (level, ipix) and inverse function [105]
- compute z more stably; improve on z2dec [101]
- use more stable cos(Dec) term [94]
- Fix get_interp_weights for phi=None case [89]
- Add pix2vec, vec2pix, ang2vec [73]
- Add ``pixel_resolution_to_nside`` function. [31]

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- Expand benchmarks to include ang2pix, nest2ring and ring2nest. [62]
- Use OpenMP to parallelize the Cython wrappers. [59]
- Renamed the ``healpix_neighbours`` function to ``neighbours`` and added
a wrapper to the high-level class. [61]
- Fix bilinear interpolation which was being done incorrectly, and added
a new ``bilinear_interpolation_weights`` function to get the interpolation
weights. [63]

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- Initial release