GF-9700 WebServiceSample Update

Issue: Yahoo API upcoming.events has been removed, no data is shown on
success and no error message is coming.
Fixes:
1) Used other working Yahoo APIs, e.g., weather.forecast and geo.places
APIs.
2) Used "onyx.Popup" to show failed scenarios. Provided proper error
message.
3) Added Error Handling scenarios for the sample.
4) Refreshed textArea.