[FEDIZ-79] Encoding of SignInResponse configurable

git-svn-id: https://svn.apache.org/repos/asf/cxf/fediz/trunk@1574223 13f79535-47bb-0310-9956-ffa450edef68

Conflicts:
	plugins/jetty/src/main/java/org/apache/cxf/fediz/jetty/FederationAuthenticator.java