Simplify prerequisites for rvm installation because now rvm know how to install needed packages
Lock chef at 10.32.2 since my cookbooks are not compatible with chef 11+
Change git:// repo in favor of https:// which works behind a proxy at work
Switch to ruby 1.9.3 in ./run-chef-solo.sh
Change the logic to ensure I'm added as a 'sudo nopasswd' user