Ecmwf-models

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- ERA5T images are downloaded and sliced correctly
- Code formatting with yapf

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- Program `era5_download` returns exit code now (PR `27 <https://github.com/TUW-GEO/ecmwf_models/pull/27>`_);
- Program `era5_reshuffle` can now take a bounding box to reshuffle spatial subsets;
- TravisCI was replaced by Github Actions;
- Pyscaffold 4 is used; contributing guide added; pre-commit added;
- Code formatting with black (line length 79);

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- Update pyscaffold structure
- Drop support for python2
- Travis deploy to pypi

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- Fix bug when creating 0.1 deg grid cells (floating point precision)
- Missing variables in grib files are now replaced by empty images.
- Read variable names from grib files from cfVarNameECMF instead of short_name field

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- Add support for downloading, reading, reshuffling era5-land
- Add support for reading, reshuffling points over land only (era5 and era5-land)
- Add function to create land definition files
- Test with pinned environments

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- Change default time steps to 6 hours.
- Add more tests, also for download functions
- Update documentation, add installation script
- Fix bugs, update command line interfaces, update dependencies
- Separate download programs for ERA5 and ERA Interim
- Change the ERA5 download api to use cdsapi instead of ecmwf api
- Update package structure to better separate between the ERA products
- Add look-up-table file for more flexibility in variable names passed by user
- Update readme