Rename encodings to encoding.

Readme.md

enstools/encoding/__init__.py

enstools/encoding/compressors/__init__.py

enstools/encoding/compressors/availability_checks.py

enstools/encoding/compressors/blosc.py

enstools/encoding/compressors/compressor_class.py

enstools/encoding/compressors/no_compressor.py

enstools/encoding/compressors/sz.py

enstools/encoding/compressors/zfp.py

enstools/encoding/definitions.py

enstools/encoding/encodings.py

enstools/encoding/errors.py

enstools/encoding/rules.py

examples/example_01.py

test/test_classes.py