When provisioning the centralauth role:
```
==> default: Notice: /Stage[main]/Ruby::Default/Ruby::Ruby[2.0]/Ruby::Gem[ruby2.0-bundler]/Exec[gem_install_bundler_2.0_>=0]/returns: ERROR: Could not find a valid gem 'bundler' (>= 0), here is why:
==> default: Notice: /Stage[main]/Ruby::Default/Ruby::Ruby[2.0]/Ruby::Gem[ruby2.0-bundler]/Exec[gem_install_bundler_2.0_>=0]/returns: Unable to download data from https://rubygems.org/ - bad response Not Found 404 (https://rubygems.global.ssl.fastly.net/latest_specs.4.8.gz)
==> default: Notice: /Stage[main]/Ruby::Default/Ruby::Ruby[2.0]/Ruby::Gem[ruby2.0-bundler]/Exec[gem_install_bundler_2.0_>=0]/returns: ERROR: Possible alternatives: bundler
==> default: Error: gem2.0 install bundler --version '>=0' returned 2 instead of one of [0]
```
... and absolutely everything seems to depend on that gem. https://rubygems.global.ssl.fastly.net/latest_specs.4.8.gz says "The specified bucket does not exist".