Merge pull request #20 from esa/improvements

refactored newton method

verbosity as an argument

new version

Merge pull request #17 from esa/ml-dsgp4

ml-dsgp4: python file, tutorials, and docs

Merge pull request #12 from esa/kepler_equation

kepler equation

Merge pull request #11 from esa/batching_improvement

batching

Update __init__.py

small fix for test

Update README.md