added description for vagrant to the readme

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
move from vagrant-librarian-puppet -> librarian-puppet

I experienced some SSL-resolution issues with the vagrant plugin. Move to raw librarian-puppet instead

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
add list of included modules to readme

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>