Documentfeatureselection

fixed these issues,

https://github.com/Kensuke-Mitsuzawa/DocumentFeatureSelection/issues/35
https://github.com/Kensuke-Mitsuzawa/DocumentFeatureSelection/issues/34

and following changes

- able to install for python3.7
- added docker compose for dev & test
- deleted code for rest api

The following bug case is fixed. When your input feature type is `word`, `ScoredResultObject. convert_score_matrix2score_record ()` sends you a feature is str of list (`[str]`).

Now, `ScoredResultObject. convert_score_matrix2score_record ()` shows you a feature `str` when input feaure type is word.

Fixed following issues in the version.
https://github.com/Kensuke-Mitsuzawa/DocumentFeatureSelection/issues/32
https://github.com/Kensuke-Mitsuzawa/DocumentFeatureSelection/issues/29

- Now the package can be independent as web-appliaction.
- The web application is easy to build with docker

- Cython computaion is available on BNS also
- It cleans up dirty dependencies between modules