Spring component-scan cleanup

Use service and dao beans in application context and controllers in
servlet context. This prevents controller beans from being created twice
in application and servlet context witch causes some trouble in the
past.

src/main/webapp/WEB-INF/spring/spring-main.xml

@@ -29,7 +29,7 @@
 	
 	<import resource="spring-security.xml" />
 
-	<context:component-scan base-package="de.thm.arsnova" />
+	<context:component-scan base-package="de.thm.arsnova.dao,de.thm.arsnova.services" />
 	<context:annotation-config />
 
 	<task:annotation-driven />