Resolve JS hint errors

Minor touch up so it passes validation
@gkindel The reason you can not repro the problem in Node is that Node does not use the `context` argument, so you could even do this in Node: `('CSV', null, function() { return CSV; })` and it still works.

Yeah I think that `this` is used in almost all of the libraries to pass the global scope, so it should work in Node too.

I'm not sure of the other envs, because I'm just using browsers and Node.