Improve subdirectory support by expanding subdirectory paths

* Update alpha_table.erb and namespace_object.rb
* Update Gemfile.lock (via `bundle install`)
* Update .ruby-version to be the latest ruby version
* Remove the "ruby-" prefix from .ruby-version

#### Before in doc/requirements/features.html
![screen shot 2013-12-05 at 23 01 35](https://f.cloud.github.com/assets/1694055/1690069/4b3ca26e-5e38-11e3-9728-337b2fa92265.png)

#### After in doc/requirements/features.html
![screen shot 2013-12-05 at 22 59 22](https://f.cloud.github.com/assets/1694055/1690068/4a3998d6-5e38-11e3-9798-2fa08e7e76ab.png)