Split install script into general part to do the git clone, and installDependencies.sh in the brewpi-script repo.
Also put quotes around simple variable usage.
1. More checks for existence of files
2. Prettier printing
Merge remote-tracking branch 'origin/master' into develop

Conflicts:
	install.sh
Backup of both directories, better backup dir names, used cp -R, no need for GLOBIGNORE now