Function deprecate

code/gmane/Chart.bundle.js:2337–2347

(msg, fn)

    }

    function deprecate(msg, fn) {
        var firstTime = true;

        return extend(function () {
            if (firstTime) {
                warn(msg + '\n' + (new Error()).stack);
                firstTime = false;
            }
            return fn.apply(this, arguments);
        }, fn);
    }

    var deprecations = {};