rails/arel — pull request #185 by beedub (2013-06-03 17:42:54+00:00)
Title: Update gems source to secure rubygems.org

Addresses the warning when running tests:

```
The source :gemcutter is deprecated because HTTP requests are insecure.
Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not.
```