Jasmine Mocha Support

[victor-shelepen]

Convert tests to a more standard way. It is very hard to add new features to for external developers. Your library provides enough functionality. But it is not so well maintainable.

[shadowspawn]

Thanks for the feedback. I was actually doing some research on this just yesterday, and can refer you to #649

[shadowspawn]

@mojavelinux converted a couple of the test files to ava in #755 to show what it looks like, which I thought was a useful way of seeing real code for a modest time investment. If someone is interested in showing what it would look like using mocha, you could do a draft Pull Request with the same two files and a mocha setup.

Edit: @CheshireSwift has done some work in https://github.com/CheshireSwift/commander.js/tree/649-test-refactor

[shadowspawn]

Closing this in favour of #649