API endpoint docstring

    def post(self):
        """
        Create a new user document in the users and cluster users database.
        :json string username: required, the requested username
        :json string password: required, the requested password
        :json string email: required, and email address to be associated
            with the account
        :json string first_name: required, the user's first name
        :json string last_name: required, the user's last name
        :json string company: optional, the user's company
        :json string cluster: optional, the desired cluster/data location
        :json string plan: optional, the Cloudant usage plan
        :json string product: optional, the product the user is subscribed to
        :json integer pardot_vid: optional, the Pardot visitor id
        :json string country: optional, the user's country
        :json string state: optional, the user's US state
        :statuscode 201: {'ok':True} user data accepted for creation.
            A DNS entry has been created and the load balancers refreshed.
        :statuscode 302: The response is a redirect to the new user's dash
            login, or back to the sign up page with an error encoded in
            the url
        """