Seq2pat

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Major:
- Add one-hot encodings, by mining patterns locally (csp_local.py) or globally
(csp_global.py) in each sequence
- Add Dichotomic Pattern Mining notebook, running on sample data
- Clean up C++ vector variables datab_MDD, mdd_q from calling Build_MDD
- Clean up vector variable attr in node_mdd.hpp
- Clean up vector variables indic_vec, result from calling Freq_miner

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Minor:
- Set up CI for seq2pat
- Add badges in the README file
- Add license information on pypi

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Minor:
- Raise the value error when min_frequency is a percentage, while it is set to
be less than 1/(Number of sequences). See Issue 14 for details.
Thanks to qxzhou1010 for bringing this to our attention.
- Have the item-integer_ID map to be fixed and the order of output patterns to
be fixed.
- Update unit tests and docs.

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major:
- Added include package to setup.py so that backend artifacts are also installed

minor:
- Replaced fmr-llc entity with fidelity
- Update JOSS paper

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- Initial public release.

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- Development starts. Unstable.