Remove "cookies" module declaration

[bjoluc]

There is a quite popular Node.js cookie library called cookies on npm that – absolutely justified – declares a "cookies" TypeScript module. This complicates things in isomorphic applications where both libraries are included. A very good example for this is redux-persist-cookie-storage – I've seen people ts-ignoring because of this :cry:

@ScottHamper I would be super-glad if you could have a quick look at this one! Thanks :)