make this tool work with Opera Blink, and with B2G (by adb-pulling the webappsstore.sqlite database to local disk)
brain cramp; I was thinking of 0.6 vs 0.8 for os.tmpDir
Merge pull request #3774 from jrgm/inspect_localstore-b2g

update inspect_localstorage to work with B2G (and fwiw opera blink)