Automated checkin: version bump for fennec 23.0b4 release. DONTBUILD CLOSED TREE a=release

--HG--
branch : MOBILE230b4_2013070822_RELBRANCH
Added FENNEC_23_0b4_RELEASE FENNEC_23_0b4_BUILD1 tag(s) for changeset b6bd24d58e72. DONTBUILD CLOSED TREE a=release

--HG--
branch : MOBILE230b4_2013070822_RELBRANCH