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.
Merge pull request #21 from notalex/OTWO-3248

OTWO-3248: Convert Ohloh SCM into a gem