How to setup Uno + xbee shield 1.1 + wee wifi chip?
As far as the Wi-Fi and Uno is concerned, it's not too difficult. You should download its library for Arduino, which is available on Github and then try its example named Wifi Client. 

In this example, change your SSID and password, and run serial terminal. It will show you that your Arduino is connected to Wi-Fi and it will also display your IP Address.

Now enter this IP address in your browser and it's like you are pinging your Wi-Fi shield.  Soon it will display your analog values. Just make sure your computer and your Wi-Fi chip are connected to the same Wi-Fi connections.