Monkeypatch the CFFI Verifier to prevent the implicit compile

![ma9vmor](https://cloud.githubusercontent.com/assets/145979/5050783/00fb220e-6bff-11e4-88f7-1d423dd9388e.gif)

Why are we md5'ing `os.urandom()`? Can't we just `binascii.hexlify(os.urandom(n))`?