Remove jruby-1.7.0.preview2 install script
Remove jruby-1.7.0.preview2 install script

This is handled by ruby-build now, and as such the custom installation
instructions are no longer required.

jcf/ansible-dotfiles,jcf/ansible-dotfiles,jcf/ansible-dotfiles,jcf/ansible-dotfiles,jcf/ansible-dotfiles