Add wrapt library

The wrapt library makes decorators much more useful than
with just regular decorators, especially in cases where
the decorator wants to know what object it is attached to.

Docs @ http://wrapt.readthedocs.org/
Module @ https://pypi.python.org/pypi/wrapt

Projects that would like to use this to create a more
universal decorator method:
 - TaskFlow
 - Rally
 - Others?

Change-Id: I26e78d34c2d12b5c9dbb520a09b618c579b84084
Merge "Add wrapt library"