Automated checkin: version bump for fennec 20.0b1 release. DONTBUILD CLOSED TREE a=release

--HG--
branch : MOBILE200_2013022008_RELBRANCH
Added FENNEC_20_0b1_RELEASE FENNEC_20_0b1_BUILD1 tag(s) for changeset 969088e04664. DONTBUILD CLOSED TREE a=release

--HG--
branch : MOBILE200_2013022008_RELBRANCH