added toString to error for debug and display

Author: jricher

openid-connect-client/src/main/java/org/mitre/openid/connect/client/AuthorizationEndpointException.java

@@ -30,4 +30,12 @@ public String getErrorDescription() {
 public String getErrorURI() {
 return errorURI;
 }
+
+/* (non-Javadoc)
+ * @see java.lang.Object#toString()
+ */
+@Override
+public String toString() {
+return "AuthorizationEndpointException [error=" + error + ", errorDescription=" + errorDescription + ", errorURI=" + errorURI + "]";
+}
 }