title: autotest on ubuntu does nothing
body: <p>Running either $autotest or $autotest -f gives the same result:</p>
  
  <p># Waiting since [timestamp]</p>
  
  <p>Changing a controller or spec file just gets that line repeated (with a newer timestamp). If I try $autotest -v, it does not include the spec or controller among the list of files for which no tests match, which I suppose is good; but it doesn't show anything else besides the #waiting line. </p>
  
  <p>If I make a change to a spec or controller while running -v, the output is a hash repeated twice with {[path/to/changed/file] => [timestamp]}.</p>
  
  <p>This is Ubuntu 9.04, Ruby 1.9.2, Rails 3, autotest 4.3.2, autotest-rails 4.1.0, and rspec 2.0.0.beta.20. (I should also say that rspec /spec on its own works fine.) Any ideas?</p>