Added functionality to remove previously saved metric map data, which can be set via the launch parameter cleanup (yes/no). The default behavior atm is to delete previously saved data, i.e. all metarooms will be created from scratch. This does not affect the creation of individual room observations
Added readme file for the semantic_map package
Updated the readme
Merge pull request #15 from RaresAmbrus/hydro-devel

Added functionality to remove previously saved local metric map cache data from disk. Updated the readme.