added HEART Mode image to footer

openid-connect-server-webapp/src/main/webapp/WEB-INF/tags/copyright.tag

@@ -1,2 +1,4 @@
 <%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
+<c:if test="${ config.heartMode }"><span class="pull-left"><img src="resources/images/heart_mode.png" alt="HEART Mode" title="This server is running in HEART Compliance Mode" /></span> </c:if>
 <spring:message code="copyright" arguments="${project.version}"/>