extend Managua to the greater capital reagion

including 
- Carretera Sur (main corridor south)
- Along Carretera Masaya all the way to Granada
- to Tipitapa.
These are all areas from which there is commuting to Managua .. and given the low amount of data this also just a few Mb anyways.
Merge pull request #121 from jaakkoh/patch-1

extend Managua to the greater capital reagion