Comment 4 for bug 328707

Two things:

- It needs a test. :) (Or it needs to update a test if the change
  would cause a test to break.)

- I'm -1 on automaticaly creating the download cache, in general,
  especially with makedirs. I'm willing to compromise. :)

  I'm willing to create the directory if it's in ~/.buildout or in
  buildout-directory. I strongly prefer that it be created only if
  it's imediately in one of these (iow, use mkdir).