Update Guice version to 4.0-beta5
Update Guice version to 4.0-beta5

Beta 5 releases the fix to Cookie mutability bug [1], so that we can
switch again to Central repository and don't need custom Guice
guice-servlet build.

[1] http://code.google.com/p/google-guice/issues/detail?id=806

Change-Id: Ia766f3d9163afdae06ea7c702824909a8349b98e

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