Fix samples for packaging

- Temporary add build to depend on bootJar
  so that samples get created as fatjars.
- Required as boot's plugin is currently being
  re-implemented and this feature is a bit broken.
- Relates to #342

build.gradle

@@ -455,6 +455,7 @@ configure(sampleProjects()) {
 		testCompile "org.hamcrest:hamcrest-library"
 		testCompile "junit:junit"
 	}
+	build.dependsOn bootJar
 }
 
 project('spring-statemachine-samples-common') {