Don't ignore error cases where remote resource can't be found on the path for Google Drive.
add minimal googledrive-suite, reduced from existing dropbox-suite
add regression tests for https://github.com/rakyll/remotestorage.js/commit/aa4a9a200ad7fb54ba95f498f9703fe8d67cdc8b
Merge pull request #537 from remotestorage/undefined-listing-fix

adding tests to "Undefined listing fix" pull request