First pass at tape tests instead of bats tests

[dschep]

Main advantage is that these can run on windows more easily, thus fixes #249

cc @AndrewFarley @kichik @heri16

[AndrewFarley]

This is great @dschep thanks for bootstrapping this. If you want a hand with something in particular or a second eye let me know. Happy to help. Cheers!

[dschep]

Thanks @AndrewFarley. I currently need help debugging the errors with npm not being found by spawnSync in appveyor, if someone with Windows could try to run the tests locally (clone this branch, then: npm i && node test.js) that would be much appreciated. For further help, I'm gonna first get the skip conditions worked out (ie: when not to run the docker tests) and then I'll probably want some help just porting over the remaining tests.

edit: nevermind re debugging spawnSync, googling explained the issue and switching to cross-spawn did the trick.

[dschep]

woo hooo. tests passing. temporarily cherrypicked a "fix" for #252 to make it happen

[dschep]

Merging this now as it's already way better than the current(broken) windows test coverage.