Catalog file for security xsd file to simplify its use in editors or ther tools supporting this format.

core/src/main/resources/org/springframework/security/config/catalog.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0"?>
+<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
+<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
+    <system systemId="http://www.springframework.org/schema/security/spring-security-2.0.xsd" uri="spring-security-2.0.xsd"/>
+</catalog>