Cerridwen

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* Recover from bitrot.

* Amend documentation

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* Rework package structure, picking apart
the mudball that was __init__.py.

* Add planets Uranus, Neptune and Pluto.
Very basic interface only.

* Add planets Mercury, Venus, Mars, Jupiter, Saturn.
Their interface is yet incomplete though.

* Add new Planet methods max_speed, mean_orbital_period,
relative_orbital_velocity, average_motion_per_year,
aspect_lookahead, default_sample_interval.

* Add sign change detection via Planet.next_sign_change().

* Add Moon.last_new_or_full_moon()

* Precision lowered to 0.0072 arc seconds (was 0.0036),
it was needed for proper ingress calculation.

* Update code for astropy 0.4 (rewrote one test case).

* Various bugfixes.

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* Add arc seconds to relative position

* Add right ascension, declination and ecliptical latitude

* Refurbish cli.py

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* Use astropy for time conversions

* Vast documentation update

* Extend test suite

* Remove sun data from moon endpoint response

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* Swiss Ephemeris data files are now included in the package

* Use nose instead of doctest for quick sanity tests

* Add a lot of functions (e.g. rise/set times)

* cerridwen-server: new switch --test/-t for quick testing

* Various minor amendments and changes

* New sun data computation function and API endpoint

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Initial release.