Pygrib

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* split ncepgrib2 module into a separate project
(https://github.com/jswhit/ncepgrib2). pygrib now only uses
eccodes. Docs converted to sphinx.

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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)