#164 Add main class required by the spring-boot-maven-plugin

src/main/java/org/springframework/samples/petclinic/PetClinicApplication.java

@@ -54,4 +54,8 @@ public class PetClinicApplication extends SpringBootServletInitializer {
         return application.sources(PetClinicApplication.class);
     }
 
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(PetClinicApplication.class, args);
+	}
+
 }