Bump Spring to 4.2.1.

pom.xml

@@ -65,7 +65,7 @@
     <url>https://github.com/citerus/dddsample-core</url>
   </scm>
   <properties>
-    <spring.version>4.1.4.RELEASE</spring.version>
+    <spring.version>4.2.1.RELEASE</spring.version>
     <cxf.version>3.0.3</cxf.version>
   </properties>
   <build>