Add method security web sample

Useful sample for common use case where user adds custom Authentication,
a form login, *and* global method security all the the same application.

spring-boot-samples/pom.xml

@@ -33,6 +33,7 @@
 		<module>spring-boot-sample-simple</module>
 		<module>spring-boot-sample-tomcat</module>
 		<module>spring-boot-sample-traditional</module>
+		<module>spring-boot-sample-web-method-security</module>
 		<module>spring-boot-sample-web-secure</module>
 		<module>spring-boot-sample-web-static</module>
 		<module>spring-boot-sample-web-jsp</module>