title: What's a good free bug tracking system that integrates with Mercurial and/or bitbucket?
body: <p>I am a lone developer working on many projects simultaneously, and keeping all these bugs in my head has become burdonsome. I've been using some "task" websites to manage my bugs for a while now, and it's been relatively sufficient. However, my current project just exploded in scope and now I need something way more robust. I currently use Mercurial and BitBucket for my version control and repo respectively, so I was hoping someone knew of something that integrated with those. At the very least, I'm looking for a free bug tracking system.</p>
  
  <p>PS: aware of <a href="https://stackoverflow.com/questions/86394/free-cheap-task-bug-management-software">this question</a> but I couldn't find anything with HG integration.</p>
  
  <p>Thanks!</p>