added setPlaying and now working on docs

lib/PMChannel.js

@@ -24,6 +24,11 @@ var PMChannel = (function () {
 	}, {
 		key: "getMessage",
 		value: function getMessage(key, value) {
+
+			if (this.messages.length > 1000) {
+				this.messages.splice(0, 1);
+			}
+
 			var _iteratorNormalCompletion = true;
 			var _didIteratorError = false;
 			var _iteratorError = undefined;