Add inverted alvar png/dae. Update sign, semaphore, localization_sign xacros...
Add inverted alvar png/dae. Update sign, semaphore, localization_sign xacros and launchs. Update spawn_test.launch with all examples
Add inverted alvar png/dae. Update sign, semaphore, localization_sign xacros and launchs. Update spawn_test.launch with all examples