fnichol/chef-rvm — pull request #145 by cbandy (2012-12-07 21:31:58+00:00)
Title: Defer to the system-wide upgrade strategy for user installs

This is consistent with the way `branch` and `version` are used. Now in our Vagrantfile for chef-solo,

```ruby
chef.json = {
rvm: {
branch: 'none', upgrade: '1.16.20', version: '1.16.20',
user_installs: [ {
user: 'vagrant',
rubies: ['1.9.3-p327'],
default_ruby: '1.9.3-p327',
} ]
}
}
```