OTWO-3248: Convert Ohloh SCM into a gem

The function url_regex needs to match "@" in urls to support Ohloh's
tests. Since rvm gem paths will have gemset@ruby pattern, @ can be a
part of url for repositories inside this library's test folder.

When we publish this, the gem should either be 1.0.0 because it is the first production release of the gem, or version 2.0.0 because we had a full production release on Ruby 1.8.6, albeit not as a gem, and this is a production release of the code for Ruby 1.9.3.