Added msg.isMentioned

lib/Structures/Message.js

@@ -37,6 +37,15 @@ var Message = (function () {
 		});
 	}
 
+	Message.prototype.isMentioned = function isMentioned(user) {
+		user = this.client.internal.resolver.resolveUser(user);
+		if (user) {
+			return this.mentions.has(user);
+		} else {
+			return false;
+		}
+	};
+
 	Message.prototype.toString = function toString() {
 		return this.content;
 	};

lib/Util/Cache.js

@@ -25,6 +25,10 @@ var Cache = (function (_Array) {
 		return found;
 	};
 
+	Cache.prototype.has = function has(key, value) {
+		return !!this.get(key, value);
+	};
+
 	Cache.prototype.getAll = function getAll(key, value) {
 		var found = [];
 		this.forEach(function (val, index, array) {