Prototype of script to setup bootcamp

**Note**: This is only a prototype and won't work without changes.
Beta version of setup

- Add request for password
- Add password in requests
- Remove echo commands
Fix some bugs
Fix set_team

Thanks to @izuzak for the tip.
Update documentation and small improvements
Improve script based on @gvwilson's comments

- Improve the help in header
- Use header when missing argument
- Add description
Add function to check if inside bc repo

The script use git to check if inside a bc repo to avoid clone
the new repository inside bc.
Add test for curl exit status

If fail when create the remote repository the setup will be
aborted.
Merge pull request #356 from r-gaia-cs/setup-script

Script to create and fill bootcamp repo