Directory matching ignores parent directories

[webnard]

If I have a tree like the following, I am unable to just ignore the private/data directory using --ignore-dir="private/data". I must use --ignore-dir="data", but if I do that my other data directories are removed.

   |-app
   |---cool
   |-----data
   |-data
   |-private
   |---data
   |---do-not-delete

The relevant code is on line 172 of lib/crxmake.rb: File.basename(path). Is there any reason not to just match against the full path? The same could be applied to files.