Stop Including "decorator" Library

[mhrivnak]

In pr_services/rpc/ we have "decorator.py", which is actually from here: http://pypi.python.org/pypi/decorator

If we want to continue using this library, we should take it out of our trunk and install it the right way, which is probably with pip in a virtual environment. Dropping it in side-by-side with our own code is confusing, allowed it to be forgotten about, and removed opportunities for us to consider grabbing a newer version.

[cchurch]

+1 (we weren't using virtualenv at the time it was added)