Gldas

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- CI and docs updates (new python versions etc.)

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- Test download function with real data.
- Support GLDAS EP
- GHA to replace travis
- Update docs
- Update Formatting

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- Travis upload release to pypi

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- New package structure
- Drop python 2 support
- Allow subsetting by bbox
- Add gldas land mask to package (no download necessary)

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- Update trollsift parsing
- Update readme
- Support reshuffling of land points only
- Test with netcdf test data

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- Add support for GLDAS version 2.1
- Compress files during reshuffling.