adding siddhi 2.0.0-wso2v4 to trunk

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172144 a5903396-d722-0410-b921-86c7d4935375
adding siddhi to CEP build

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172145 a5903396-d722-0410-b921-86c7d4935375
updating Siddhi version

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172146 a5903396-d722-0410-b921-86c7d4935375