Implement feature #1652 google custom search support. #1667
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This is a proposed implementation for issue #1652.
For now we only support the look and feel "results only" and the engine must be set to use that layout. Add a google section to the search providers and search_form and search layout. I duplicated the code the layout search form even though perhaps the code could be refactor in a separate include to have all the search provider in one place.