Added dummy script to stand in for topological navigation when missing a robot or proper simulation.

Useful for testing.
Added launch file for dummy topological navigation and install targets.
Merge pull request #103 from hawesie/hydro-devel

Added dummy topological navigation system
Merge branch 'hydro-devel' of https://github.com/strands-project/strands_navigation into hydro-devel

Conflicts:
	topological_utils/CMakeLists.txt