Add a dummy file to add not_a_file.pipe
Add a dummy file to add not_a_file.pipe

Git refuses to add the directory because it's empty.

mathstuf/sprokit,Kitware/sprokit,linus-sherrill/sprokit,mathstuf/sprokit,Kitware/sprokit,mathstuf/sprokit,mathstuf/sprokit,Kitware/sprokit,Kitware/sprokit,linus-sherrill/sprokit,linus-sherrill/sprokit,linus-sherrill/sprokit