Added tu-darmstadt-ros-pkg repositories to indigo

The following repositories are going to be released in indigo soon after having done some pre-release tests:

- hector_gazebo
- hector_localization
- hector_models
- hector_quadrotor
- hector_worldmodel
- topic_proxy

The `release:` sections have no version tags yet (no releases, only for prerelease testing with version "latest").

The following repositories have been added to build documentation only:

- cpp_introspection
- hector_navigation
- hector_nist_arenas_gazebo
- hector_quadrotor_apps
- hector_vision
- hector_visualization
- rosmatlab
- ublox