Use tox for tests, add linter

Tom Coldrickrequested to merge
coldtom/tox into master

Converts the tests to use tox, as well as using the linting config from BuildStream to add a linter.

Modifies how dependencies are specified into a more extensible way, although I'm not particularly happy with the current install-requires on buildstream, I guess this will be fixable once there are some dev snapshots of bst2 available on PyPI.

Closes #5 (closed)

Edited by Tom Coldrick

Merge request reports