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- add tox for easier reproduction of travis builds
- add idempotence to install_client_deps.sh if CI=1
- mov modules into src/
- update setup.py to install everything as separate modules
- add docs and qa tox jobs
- update documentation

Todo:

- merge django-representatives
- merge django-representatives-votes

It includes latest research by Arnaud Fabre but I ended up squashing all
commits and adding my own fixups in this commit.

Also:

- the import command is tested,
- code was PEP8'ed
- untested code was removed,
- duplicate country Israel was removed and migration was added,
- requirements were deleted in favor of proper setup.py.

Also:

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