Eliminate bootstrap scripts and push repo setup to setup.rb.

We now assume the user knows to register if necessary (on RHEL), and yum
install ruby. After this we try to do everything in setup.rb.
Update setup.rb for user specific devel setups.
Add a --skip-installer option for anyone who wants to run it themselves.
Prevent git clone failures as devel user due to chdir permissions.
Cleanup.
Update README, plan ahead with rhel6/centos6 targets.
Easier copy paste of a README command.
Update for Vagrantfile.

With help from Eric. :)
Merge pull request #42 from dgoodwin/setuprb

Push Logic to setup.rb
clean up puppetlabs-release repo on reinstall as well
Merge pull request #43 from jmontleon/clean-puppetlabs-repo

clean up puppetlabs-release repo on reinstall as well
Fixes reference to relative path of katello-installer to be generic of vagrant.
Merge pull request #44 from ehelms/fix-relative-path

Fixes reference to relative path of katello-installer to be generic of v...