Added deleteChannel implementation

lib/Client/Client.js

@@ -287,6 +287,23 @@ var Client = (function (_EventEmitter) {
 		});
 	};
 
+	// def deleteChannel
+
+	Client.prototype.deleteChannel = function deleteChannel(channel) {
+		var callback = arguments.length <= 1 || arguments[1] === undefined ? function (err) {} : arguments[1];
+
+		var self = this;
+		return new Promise(function (resolve, reject) {
+
+			self.internal.deleteChannel(channel).then(function () {
+				callback();
+				resolve();
+			})["catch"](function (e) {
+				callback(e);reject(e);
+			});
+		});
+	};
+
 	return Client;
 })(EventEmitter);