Add support for jsnext:main

[simoncarpinter]

• fix typo (jsnext:main, not jsmain:next)
• include src/ in distributed version so that jsnext:main references a real artifact

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This change is

[simoncarpinter]

Actually, scratch this. jsnext:main expects to find code that has been transpiled except for its module syntax. Artifacts in src/ are not transpiled.

[deontologician]

Hey, I think all we need to do is add an es6 output in compile.sh where we use the correct preset to transpile all but imports. Thanks for bringing this to our attention, I'll try getting it to work

[simoncarpinter]

Awesome :). For reference, I realised this was problematic somewhere around 11pm NZT last night and figured I'd close it until I could hack on it a little further -- I meant to come back around to it sometime in the next couple of days after digging into how your compiling/webpack setup works :). If you're looking into it now then that saves me some digging in unfamiliar territory (I'll admit that JS build tooling is one of my least favourite parts of the ecosystem).