Headless test runner

[bcomnes]

So headless test running works pretty well already with tape-run, but browserify is pretty limited when it comes to file globbing. Also, it would be cool to not have to install both everywhere.

vhs-tape should bundle a globbing cli with tape-run or browser run or something and support electron peer dependencies by default, but also make it openable in browsers or electron.

This should be relatively easy to achieve. I think an interactive UI server would be a lot more work.