Current coverage is 87.89%

Merging #3553 into master will decrease coverage by 0.01%

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Definitely in favor of getting tests going for babel-types; I need to merge #3267 =D (There's also #3174 that'll need feedback if it's going to proceed, as it changes public API.)

I was also wondering about the ES6 aspect -- see last sentence here: #3267 (comment). I think it's only top-level test files that aren't going through babel-register anyway. If a test file require()'s other modules I think those go through the require hook.

@jmm lol probably the longest PR open for a while..

Yeah definetely want to be able to use es2015 since it's just weird to switch back and forth