Pygrib

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* restore python 2 compatability.
* distinguish between run and build time dependenices in setup.py (PR 112).
* Fix problem printing grib messages with NLDAS grib files (PR 141).

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* fix error in latlons method for lambert projection and polar stereo when
jScansPositively == 0 (PR 129).
* Add README.md as long description for pypi (PR 130).

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* fix error in gaussian latitudes (issue 102)
* fix MemoryError when computing rotated lat/lons (issue 99)

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* default lib name switched from grib_api to eccodes (can still
modify in setup.cfg).
* fix for latlons method for mercator domains that cross Greenwich
(issue 67).

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* add .travis.yml for automatically running test.py using travis CI.
* make sure ftime cannot be None (to avoid crash in grib_list).
* update g2clib_src to version 1.6.0 from NCEP.
* use forecastTime if available to define validDate - otherwise
fall back on end of stepRange (issue 40).
* comment out reference to private jasper variable (inmem_) in
g2clib_src/enc_jpeg2000.c (no longer available in latest version of
Jasper lib)

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* Fix for test failure on python 3.5 (issue 24).
* improvements to setup.py, including making it more windows-friendly.
Added windows support in setup.cfg, should now be possible to build on
windows if grib_api is built with MSVS (see
https://software.ecmwf.int/wiki/pages/viewpage.action?pageId=48109524).
Pull request 18.
* make has_key gribmessage method more robust (it was returning False in
cases when a key actually did exist - issue 9).