Add file ParseJS.hs for review.

This is the first layer in the pipeline. It turns the parse tree (output from hackage.haskell.org/package/language-javascript-0.4.5) into a more useful AST.

PTAL.
the above two clauses can be combined:

toJSAST (NS (JSBreak list _) srcSpan) =
    [AWSS
        (Statement
            (EWSS (Break (liftM (identifierGetString . jsnGetNode) $ listToMaybe list) srcSpan))
        srcSpan
    ]