JS nodes produced by compile() should have source in their loc

[RReverser]

JavaScript AST nodes produced by CoffeeScript.compile(csAST, options) should contain inputSource value in loc.source according to Mozilla Parser API spec so it would be safe to pass such AST to further transformers without breaking linkage to original files (which needs to be preserved for source map generation on final step).

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[RReverser]

@michaelficarra Could you please have a look at this? Seems to be trivial thing to add, but I can't compile CoffeeScriptRedux on Windows machine :(