Add a test that verifies the first argument passed to the verify callback.  And make it pass.
ChangeLog
merge master
This depends on a new feature first introduced in cryptography 0.4.
the minimal documentation requirements
add a missing word
Merge pull request #88 from exarkun/set_verify-callback-argument

Fix a regression in which the first argument of the "verify" callback was incorrectly passed a `Context` instance instead of the `Connection` instance.