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
Add pyca/cryptography to global requirements

barbican would like to convert some of its internal encryption
to using the cryptography project from PyCA. Specifically our
dev plugin would benefit from a switch to cryptography as it
allows us to use AEAD modes. We will also need this in the
future as cryptography adds X509 and CMS support.

The project supports Python 2.6-3.4 as well as PyPy and is being
packaged for FreeBSD, Debian, and Ubuntu.

Additionally, this is already a second-level requirement when
using PyOpenSSL.

Change-Id: Ic0d508faef9de347bf7cb2436a433096779cf8ac
Merge "Add wrapt library"
Merge "Add pyca/cryptography to global requirements"