Set version to 2.0


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/commons/branches/commons-2_0@1628285 13f79535-47bb-0310-9956-ffa450edef68
Added my key for signing the release


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/commons/branches/commons-2_0@1628293 13f79535-47bb-0310-9956-ffa450edef68