Adding InResponseTo to SAML Response element and removing compressions while encoding

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@173170 a5903396-d722-0410-b921-86c7d4935375
Making RelayState optional

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@173171 a5903396-d722-0410-b921-86c7d4935375