shutil.copy error

[benureau]

I get an error relating to the Hexlified class having no encode method, when copying binary files inside the fake filesystem, using shutil.copy. I don't have the error on hand anymore, I can regenerate it if you need. I made a very crude fix for it, but I am sure there is a better way:
benureau@8e702c4

[mrbean-bremen]

I think, SetContents() is not the right function to be used in copyfile() in this case.
I would propose to either directly assign the contents in copyfile(), or add a respective CopyContents() method (not sure about the coding guidelines here).

[mrbean-bremen]

On a second thought, I find your fix better, with the exception that there is no need to decode and encode the contents in this case. I added a small test that reproduces the problem without the fix - will put it in a PR in a second.

[jmcgeheeiv]

Closing due to @mrbean-bremen #108.