v2.0.0

Remove Cucumber and Aruba entirely. The cucumber.rb file is still here, so this should be compatible with previous releases, but generally, I was not able to get the code working with the latest version of Aruba, as many of its internals had changed, and it is not sufficiently clear on what it's doing or why in order for me to debug.

I have also grown a distaste for these sorts of tests over the years as they obscure what is actually be tested and are hard to write and maintain.