Testing, testing?

This release cleans up the root of the repo and pushes files not directly needed to run the script into an ./extras directory.
The release also introduces a rudimentary test setup - with goals to improve on them over time to make future releases more stable.

I've opted to up the major version to 3 due to the extras directory alone in case anyone is directly linking the files that were moved, and as such v3 is not necessarily "backwards compatible" with v2.