Fixed #8113.  Made `get_width_height` a `GoogleZoom` method that takes the extent instead of an envelope so it may handle Point geometries.  Thanks to Santiago Aguiar for the bug report.
Fixed #8113.  Made `get_width_height` a `GoogleZoom` method that takes the extent instead of an envelope so it may handle Point geometries.  Thanks to Santiago Aguiar for the bug report.


git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@8428 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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