Label JavaScript-y files

[mcandre]

For use with jsfmt and other JavaScript linters that have gaps identifying JavaScript files in large, multi-programming-language, recursive directory projects.

• [ ] Add a field JavaScripty to results, similar to POSIXy.
• [ ] Add a field Minified to results.
• [ ] Treat *.js file patterns as JavaScripty.
• [ ] Treat bin/<script-without-an-extension> as JavaScripty, as long as the shebang features node or iojs interpreter.
• [ ] Treat *.min.*, *-min.* file patterns as Minified.
• [ ] Add a CLI flag to stank, for restricting results to non-minified, JavaScripty files.