adding queequeg formula

queequeg is python script to perform grammar check on text files.

I don't know how to delete these 2 hugly unusefull commits from my pull request to have a cleaner one... If someone can tell me, i'll do it.

Ok then let's go for:
``` ruby
if File.exist? "dict.cdb"
  bin.install "dict.cdb"
else
  bin.install "dict.txt"
end
```