Get browserstack tests passing again

[Josh Duff]

Thanks to some help from another dev, browserstack tests report their results much more reliably now. I've updated package.json to use the better versions. a3a62f8

It looks like some tests aren't passing any more, most notably the webpack test that tries to read from disc. We should have some difference between node tests and browser tests so that that test doesn't get loaded.

I'm not sure why some of those other tests aren't passing (I saw one about console.error not being a function in Chrome, which it totally is). It would probably be easier to make sure everything passes with tape-run first.

[Josh Duff]

I've given up on Browserstack