Wraps JSONified output for JSONP requests.

def jsonp(func):
    """Wraps JSONified output for JSONP requests."""
    @wraps(func)
    def decorated(*args, **kwargs):
        callback = request.args.get('callback', False)
        if callback:
            data = str(func(*args, **kwargs).data)
            content = str(callback) + '(' + data + ')'
            mimetype = 'application/javascript'
            return current_app.response_class(content, mimetype=mimetype)
        else:
            return func(*args, **kwargs)
    return decorated