Pycrs

- Add search functions to lookup epsg.io
- Add to_epsg_code() method from, based on prj2epsg.org (47, fitoprincipe)
- Switch to using epsg.io when looking up epsg codes
- Fix broken spatialreference link by switching to SSL
- Added Clarke 1880 ellipsoid
- Use default datum ellipsoid when ellipsoid not specified
- Better warning and error when proj4 ellipsoid cannot be found
- Misc bug fixes

- Misc docstring changes
- More flexible parsing, in case projection is not the second element
- More informative exceptions

- API Changes:
- Dropping CRS wrapper class, instead handling GeogCS or ProjCS directly
- Change module names to load.py, and parse.py
- Move Ellipsoid, Datum, and Projection to their respective modules
- Allow proj4 input and output as dict
- Fixes:
- Added more documentation
- Fix +f interpretation
- Include reading +rf parameter
- Better ellipsoid support for +a and +b
- Fix Python 3 bugs
- Fix proj4 standard parallels being ignored
- Parse WKT CS names which were ignored before
- Support for prime meridian city names

- Fixed various bugs
- Pip install fix for Mac and Linux
- Python 3 compatability

- First official release