Automated checkin: version bump for firefox 20.0b6 release. DONTBUILD CLOSED TREE a=release

--HG--
branch : GECKO200b6_2013032008_RELBRANCH
Added FIREFOX_20_0b6_RELEASE FIREFOX_20_0b6_BUILD1 tag(s) for changeset 2b185ce3436a. DONTBUILD CLOSED TREE a=release

--HG--
branch : GECKO200b6_2013032008_RELBRANCH
Added tag SEAMONKEY_2_17b3_BUILD1 for changeset FIREFOX_20_0b6_BUILD1. CLOSED TREE a=release

--HG--
branch : GECKO200b6_2013032008_RELBRANCH
Added tag SEAMONKEY_2_17b3_RELEASE for changeset FIREFOX_20_0b6_BUILD1. CLOSED TREE a=release

--HG--
branch : GECKO200b6_2013032008_RELBRANCH