Added sginal handling (CTRL+C) and the capability to run Fennec as non root
- Added signal handling for SIGINT (CTRL+C), SIGTERM and SIGHUP. When any of these signals are sent, Fennec will stop collecting artifacts and start cleanup
- Added the option '--non-root' to add the capability of running Fennec with non root permissions (not recommended, but you have the option :D)
- Small changes to the help message