Publish esprima js files

[bretkikehara]

By publishing the ES5 in lib and ES2015 and lib.es2015 to npm, the esprima library can be directly referenced leading to more control over what ends up in a output bundle. While the webpack bundle works well, it is essentially a "binary" that can't be "tree-shaken" to remove support for functionality that isn't needed. In my case, JSX support is not needed, so I want to remove JSX from the output. Having individual files allows me to import only those files necessary to parse scripts.

[jsf-clabot]

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