Update setup.sh clone to point to github/mozilla.

The clone code should point towards the mozilla repositories.
Previously they were pointing towards the repositories in st3fan's account.
Update README.md to point to mozilla repository

Replace https://github.com/st3fan/minion with https://github.com/mozilla/minion
Print usage if called without command

Add a default branch for the case block to print usage if no command is provided.
setup.py -> setup.sh when starting the frontend
Merge pull request #2 from pbkracker/patch-1

Update setup.sh clone to point to github/mozilla.
Merge pull request #3 from pbkracker/patch-2

Update README.md to point to mozilla repository
Merge pull request #4 from pbkracker/patch-3

Print usage if called without command
Merge pull request #5 from pbkracker/patch-4

setup.py -> setup.sh when starting the frontend
Update README.md
Updated the setup.sh script for the new backend
Fixes #8 clone minion-backend. Fixes #9 remove optional plugins from setup.sh.
Fixes #7 updated README with the correct backend url and correct setup command.
Fixed command to launch backend and added more options.
Merge pull request #10 from yeukhon/master

Update setup.sh and README.md for using the new backend.
minion-backend-api now needs a runserver command
Correcting rabbitmq package name.

$sudo apt-get install rabbitmq
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package rabbitmq

But, rabbitmq-server works.
Merge pull request #11 from pbkracker/patch-1

Correcting rabbitmq package name.