This works but we should really be using self.

Also assert RSA_new doesn't return NULL
Merge pull request #656 from reaperhulk/fix-openssl-backend-variables

backend -> self
add private _int_to_bn method to openssl backend
bytes and strings...yes.
A tiny formatting cleanup
Merge pull request #658 from reaperhulk/int-to-bn

Add private _int_to_bn method to openssl backend
Merge pull request #659 from alex/release-cleanup

A tiny formatting cleanup
Merge branch 'master' into rsa-signing.

The world's least conflicting conflict.

* master:
  A tiny formatting cleanup
  bytes and strings...yes.
  add private _int_to_bn method to openssl backend
  This works but we should really be using self.

Conflicts:
	cryptography/hazmat/backends/openssl/backend.py