GoogleSiteNews Dashlet: Add proxy (remote endpoint) for google api

[GoogleCodeExporter]

Create a new endpoint for google api, so that all calls to the google api uses 
Surf proxy feature.
/share/proxy/google

Thus the client code will only interact with the share site, and prevent errors 
if the client cannot reach google due to security settings or other 
restrictions.

To investigate:
-Will the google api allow load from a non standard url?
-All searches will appear to come from the same ip-adress (share server). This 
may trigger a treshhold for number of searches for google api use and a key may 
be needed.

Original issue reported on code.google.com by [email protected] on 1 Mar 2011 at 3:55