Automated checkin: version bump for thunderbird 24.0b1 release. DONTBUILD CLOSED TREE a=release

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branch : GECKO240b1_2013081314_RELBRANCH
Added THUNDERBIRD_24_0b1_RELEASE THUNDERBIRD_24_0b1_BUILD2 tag(s) for changeset f0b4b17d3305. DONTBUILD CLOSED TREE a=release

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branch : GECKO240b1_2013081314_RELBRANCH