What is with the trend to not check project files into source control? This project could be interesting, but garbage in, garbage out.

  ## File-based project format
  *.ipr
  *.iws

If you're referring to the files generated by the IDE for its own use, I find that those often contain a great deal of personal settings that are not relevant to everyone else on the team (and stomp on their settings if they clone a project).