Fix JSON Code Errors

o Import all the JsArray Object
o Let eclipse, create the MessageData:
o by importing the super class com.google.gwt.core.client.JavaScriptObject
o The MessageData should go in the com.sample.client package
o Create the blank asArrayOfStockData() method in the Sample.java code.
o Let eclipse, create the getMessage() method, in the MessageData class
o All the errors are removed, but let us make sure all is well