Add CI, add releases

[simark]

The way I found to install CanadianTracker in a "production" environment is to run poetry build, which generate an installable (using pip, for example) Python package, with a setup.py and all. We should add a CI (like Travis) that builds and publishes the build result automatically for each commit. Even though we don't have proper numbered releases, it would make it easier to install it, as a user (not developer).