[data-protocols] Google Visualisation API as Query Protocol

[Francis Irving]

It's obvious, but there is an already existing, and widely adopted by
one major vendor, API for doing exactly the kind of thing the Data
Protocols Query Protocol is for.

http://code.google.com/apis/chart/interactive/docs/querylanguage.html#Language_Syntax

I've added it to existing work in git source of this page:

http://www.dataprotocols.org/en/latest/data-query-protocol.html

What do people think of it?

Francis