Added updateMessage

lib/Util/Cache.js

@@ -68,12 +68,22 @@ var Cache = (function (_Array) {
 		}
 	};
 
+	Cache.prototype.update = function update(old, data) {
+		var index = this.get(this.discrim, old);
+		if (~index) {
+			this[index] = data;
+			return this[index];
+		} else {
+			return false;
+		}
+	};
+
 	Cache.prototype.remove = function remove(data) {
 		var index = this.indexOf(data);
 		if (~index) {
 			this.splice(index, 1);
 		} else {
-			var item = this.get("id", data.id);
+			var item = this.get(this.discrim, data.id);
 			if (item) {
 				this.splice(this.indexOf(item), 1);
 			}