New joyride build 2644

[Build Announcer v2]

http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build2644

Changes in build 2644 from build: 2643

Size delta: -0.13M

-olpcrd 0.49-0
+olpcrd 0.50-0

--- Changes for olpcrd 0.50-0 from 0.49-0 ---
  + Implement multiple key support

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