Using `python setup.py develop` did not manage to install the required dependencies.
This updates `script/setup` to use `pip install -e .` instead in order to resolve the required dependencies.
* Allow bower install of frontend components as root. Needed for frontend development in docker since everything runs as root in the docker image.
* Improve development workflow in docker
* Use LANG=C.UTF-8 in tox. Fixes installation of libraries with UTF-8 in it's readme.
* Install mysqlclient psycopg2 uvloop after requirements_all.txt again, but with a --no-cache-dir this time. Allows bootstrap_frontend to be executed in a different path like the other scripts.
