GERONIMODEVTOOLS-779 release GEP2.1.8, change the version content in manifest.mf/plugin.xml and test suits' pom, patch provided by Yi Xiao

git-svn-id: https://svn.apache.org/repos/asf/geronimo/devtools/eclipse-plugin/branches/2.1@1231849 13f79535-47bb-0310-9956-ffa450edef68
31 files changed