Integrate Chris aumann zsh autocompletion script [ref #81]
Integrate Benjamin Reitzammer bash autocompletion scripts [ref #81]
Move autocompletion scripts in ./scripts/autocompletion dir [ref #81]
Add autocompletion instructions for zsh [ref #81]
Add autocompletion instructions for fish shell
Add autocompletion.zsh Chris Aumann license header
Add autocompletion instructions for bash shell
Add Benjamin Reitzammer mention to the Authors file