[web2py] Three typos/updates in web2py online book (JSON/Pyjamas section)

[Larry Wapnitsky]

In section http://web2py.com/books/default/chapter/29/10#JSONRPC-and-Pyjamas

   1. Pyjamas is now known as PyJS, even though the libraries are still 
   called pyjamas
   2. import pyjamas.ui.KeyboardListener should read import 
pyjamas.ui.KeyboardListener 
   as KeyboardListener to work properly
   3. src="{{=URL('static','output/*pygwt.js*')}}"> should be 
*bootstrap.js*instead of 
   *pygwt.js*