remove useless require of thread
Fix Worker for use with DATABASE_URL

Closes #225
fix broken `rake qc:count`. Closes #227.

This is an easy fix that still honors the rake tasks description.
Merge pull request #223 from jipiboily/remove-useless-require

remove useless require of thread
Add tests for Worker initialization
Merge pull request #226 from cschramm/master

Fix Worker for use with DATABASE_URL
removing date and changing homepage in gemspec