v0.3

What's Changed

Added a bunch of unit tests and fixed (major) issues found while writing them. Added github CI framework to run said tests, and perform (basic) end-to-end functionality testing before allowing code to be merged to master.

• Tests and stuff by @peads in #33
• Bumping the version before tag by @peads in #34

Full Changelog: v0.2.3.1...v0.3