Add functools.wraps to decorator materials

[PythonCHB]

functools.wraps

is a decorator that copies a bunch of the metadata about the function being wrapped -- makes decorated functions more friendly.

-CHB

[PythonCHB]

Here's a blog post that goes into a bit more detail:

http://blog.dscpl.com.au/2014/01/how-you-implemented-your-python.html

[PythonCHB]

And here are a bunch more of his...

https://github.com/GrahamDumpleton/wrapt/tree/master/blog