rbenv-bundler-ruby-version: 0.1.0 (new formula)

This installs the [rbenv-bundler-ruby-version](https://github.com/aripollak/rbenv-bundler-ruby-version) rbenv plugin.
Can a test be added to do something more substantial than e.g. `--version` or `--help`? See `cmake.rb` for an example of an application formula with a good test and `tinyxml2.rb` for an example of a library formula with a good test. Thanks!