Add the ability to set encryption key identifiers for the streaming case

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1562446 13f79535-47bb-0310-9956-ffa450edef68
Allow creating an XML Signature with no KeyInfo

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1562468 13f79535-47bb-0310-9956-ffa450edef68