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Api pagination

API release

Code by @luxcem, left almost untouched.

I broke something in PyPi ^^

remove_dossiers_without_recommendation and
remove_representatives_without_votes are useful to clean the database
before dumping test fixtures.

Also:

- code was PEP8'ed
- tests were added,
- untested code was removed,
- setup.py was fixed and requirements.txt is gone,