Added tag SEAMONKEY_2_15b6_BUILD1 for changeset FIREFOX_18_0b7_BUILD1. CLOSED TREE a=release

--HG--
branch : GECKO180_2012123109_RELBRANCH
Added tag SEAMONKEY_2_15b6_RELEASE for changeset FIREFOX_18_0b7_BUILD1. CLOSED TREE a=release

--HG--
branch : GECKO180_2012123109_RELBRANCH