Added support for numeric and string literal types (fixes #156)

[mister-walter]

Added support to typed.js for string and numeric literals in types.

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[mister-walter]

@jquerybot I signed the CLA and tried changing the author information on the commit, but it seems like the CLA check hasn't been rerun yet. Hopefully replying to the jquerybot will work.

[nzakas]

Can you add a test that contains the example from the issue? Also, please update your commit message to include the issue number.

[mister-walter]

@nzakas All set, sorry about that! I put the example from the issue inside the 'parse' area of test/parse.js, hopefully that is an appropriate place for it.

[nzakas]

That is perfect, thanks!