Merge branch 'master', remote-tracking branch 'upstream/master'
- Improve gitignore
- Relocate kraken_launcher script from simulator_stack/kraken_visualisation to Scipts folder
Merge pull request #20 from routeaccess/master

Improve .gitignore, relocate simulator launcher script
added global topic Header
Merge branch 'master' of https://github.com/iit-kgp-auv-team/kraken_3.0