v0.5.0 release on PyPi

We're in the progress of making structural changes to the library and how it gets tested and deployed, while preparing for a v1.0.0 release. Most all of the existing features will continue without change, although we're making preparations for new kinds of integrations and this will change our library structure. We'll try to minimize breaking changes.

• improve our handling of Dockerfile (e.g., for use in regulated environments that require a simpler base image)
• refactored code to remove dependencies out of library which are only needed for the tutorial
• removed dependency on PyTorch

What's Changed

• prepare for version bump by @ceteri in #224
• reworking docker by @ceteri in #225 #226
• Implement pytest for current tests by @Mec-iS in #228

Full Changelog: v0.4.4...v0.5.0