New update.1 build 684

[Build Announcer Script]

http://pilgrim.laptop.org/~pilgrim/olpc/streams/update.1/build684/

-Journal-82.xo
+Journal-83.xo

--- Journal-83 ---
    * #5863 Correctly invalidate icon cache. (tomeu)
    * #3092 Change the color of the preview box. (rwh)

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