Bumps Ruby version to 2.1.1

Brings Neue's Gemfile up to date with the latest stable version of Ruby because this is driving me crazy:

![ruby-version](https://f.cloud.github.com/assets/1479130/2350976/0e9b0f72-a577-11e3-900c-de59221e2aa1.png)

:warning: This is a breaking change. You will need to update to v2.1.1 after this is merged in.