EJS.update from json url

```
EJS.update throws javascript error: 'expected ;' in case you pass json url as 
second parameter to update function. It should enclose json string into 
parentheses to work properly(at least in IE9). The fix is to replace line 112 
with var object = eval( '('+request.responseText+')' );

```

Original issue reported on code.google.com by `alber...@gmail.com` on 11 Jul 2012 at 12:25
