Cache node and Yarn installation about metabrowse HOT 4 OPEN

We could embed an sbt-launcher.jar in the repo and configure .travis.yml to be a js project. It should be possible to cache the nested node_modules directories, just by hard-coding them.

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Just throwing there a random idea, but due to the cross-breed nature of the project it would probably be easier to use Drone instead of Travis, crafting a custom Docker image with both scala and js.

However that would require hosting an installation of drone, but there may be one in place already for the Scalacenter, right @olafurpg?

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I prefer to use Travis because it's a lot simpler to setup caching. I was the one pushing for Drone at the SC originally, but at this point I've spent so much time on it that I prefer Travis.

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After #101 the npm download size is significantly smaller, CI went from 10 minutes to 5 minutes. Would still be nice to cache node_modules.

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