Add docstring for the stamp class
Add docstring for the stamp class

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