Add GazeData object and parsing

lib/com/WebSocketClient.js

 import Observable from "../utils/Observable.js";
-import { ConnectionOpenedEvent, ConnectionClosedEvent, ConnectionErrorEvent, DataEvent } from "./Events.js";
+import { ConnectionOpenedEvent, ConnectionClosedEvent, ConnectionErrorEvent,
+  DataEvent } from "./Events.js";
+import GazeData from "../data/GazeData.js";
 
 class WebSocketClient extends Observable {
 
@@ -33,7 +35,8 @@ function onError() {
 }
 
 function onMessage(event) {
-  let dataEvent = new DataEvent(event.data);
+  let data = GazeData.fromDataString(event.data),
+    dataEvent = new DataEvent(data);
   this.notifyAll(dataEvent);
 }
 

lib/data/GazeData.js

+const DATA_SEPERATOR = ";";
+
+class GazeData {
+  constructor(leftEyeX, leftEyeY, rightEyeX, rightEyeY, trackerTimeStamp,
+    systemTimeStamp) {
+    this.leftEyeX = leftEyeX;
+    this.leftEyeY = leftEyeY;
+    this.rightEyeX = rightEyeX;
+    this.rightEyeY = rightEyeY;
+    this.trackerTimeStamp = trackerTimeStamp;
+    this.systemTimeStamp = systemTimeStamp;
+  }
+
+  static fromDataString(dataString) {
+    let dataValues = dataString.split(DATA_SEPERATOR);
+    return new GazeData(dataValues[0], dataValues[1], dataValues[2],
+      dataValues[3], dataValues[4], dataValues[5]);
+  }
+}
+
+export default GazeData;
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