Updating maven constants

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@174495 a5903396-d722-0410-b921-86c7d4935375
Adding  initial implementation of messagestore-maven-plugin

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@174497 a5903396-d722-0410-b921-86c7d4935375