SEC-1093: Namespace support for jee element.

Adds a J2eePreAuthenticatedProcessingFilter to the stack, using a SimpleAttributes2GrantedAuthoritiesMapper to process the role attributes defined in the "mappable-roles" attribute. Provider uses a PreAuthenticatedGrantedAuthoritiesUserDetailsService by default.

core/src/main/java/org/springframework/security/core/authority/mapping/SimpleMappableAttributesRetriever.java

@@ -24,8 +24,7 @@ public class SimpleMappableAttributesRetriever implements MappableAttributesRetr
         return mappableAttributes;
     }
 
-    @SuppressWarnings("unchecked")
-    public void setMappableAttributes(Set aMappableRoles) {
+    public void setMappableAttributes(Set<String> aMappableRoles) {
         mappableAttributes = new HashSet<String>();
         mappableAttributes.addAll(aMappableRoles);
         mappableAttributes = Collections.unmodifiableSet(mappableAttributes);