erfa_python 2014.01.16

Python wrapper for ERFA library

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erfa_python
===========

this is a Python wrapper for ERFA (Essential Routines for
Fundamental Astronomy).

for installation, see ``doc/installation.rst``

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what's new
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. 20130815
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- rewrote the wrapper from SOFA to ERFA

. 20130830
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- registered to PyPi

. 20131222
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- added a few routines from the latest SOFA release.

. 20131226
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- completed routines from the latest SOFA release
- rename and slightly reworked the C extension to _erfamodule.c
- a module erfa.py was created especially to handle routines that use
LDBODY. some missing routines were also added into this module.
this change *is compatible* with previous version, and users do not
need to change their code.