Enhance sample to show method authorization.

samples/tutorial/src/main/java/bigbank/BankService.java

@@ -0,0 +1,15 @@
+package bigbank;
+
+import org.springframework.security.annotation.Secured;
+
+public interface BankService {
+	
+	@Secured("IS_AUTHENTICATED_REMEMBERED")
+	public Account readAccount(Long id);
+		
+	@Secured("IS_AUTHENTICATED_REMEMBERED")
+	public Account[] findAccounts();
+	
+	@Secured("ROLE_TELLER")
+	public Account post(Account account, double amount);
+}