Test the worker in its own subprocess

- run with an empty queue
- schedule one job (which uses get_current_connection and get_current_job) and
run `rqworker`
- schedule a job that itself schedules `access_self` and run `rqworker`
- Make sure the job didn't fail by assuring the failed queue is still empty
  afterwards.
- Install this package locally when running in travis.
  This actually unifies the behaviour of tox and travis as tox also builds the
  package and then installs it into each test environment.
- fix flake8 (as run by tox)

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