Modify attribute names to use "ref" instead of "id", plus use a hyphen

as an attribute value separator rather than a colon. This was changed 
for compatibility with other components in the Spring Portfolio. tests 
pass.

core/src/test/resources/org/springframework/security/config/custom-user-details.xml

@@ -9,7 +9,7 @@ http://www.springframework.org/schema/security http://www.springframework.org/sc
 	<beans:bean id="myDetails" class="org.springframework.security.config.CustomUserDetailsService"/>
 
     <repository>
-        <custom-user-service id="myDetails"/>
+        <custom-user-service ref="myDetails"/>
     </repository>
 
 </beans:beans>