New joyride build 2620

[Build Announcer v2]

http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build2620

Changes in build 2620 from build: 2619

Size delta: 0.00M

-cerebro 3.0.0-1.olpc3
+cerebro 3.0.2-1.olpc3

--- Changes for cerebro 3.0.2-1.olpc3 from 3.0.0-1.olpc3 ---
  + 3.0.2: Improved str2dict in common.py, added sample GUI under gui/

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