missing files from docs/ directory causes installation errors

[jpkotta]

I used "sudo pip install pyLisp-NG", which died with the error "IOError: [Errno 2] No such file or directory: 'docs/PRELUDE.txt'". easy_install gave the same error.

It left behind a ~/build/pyLisp-NG/ directory, so I did
  cd ~/build/pyLisp-NG/
  mkdir docs
  touch docs/PRELUDE.txt
  touch docs/HISTORY.txt
  touch docs/DEPENDENCIES.txt
  touch docs/FOOTNOTES.txt

I'm not at all familiar with python packaging, so it seems strange that it would error on missing doc files, but adding empty files got it installed and working.