jacquev6/PyGithub — pull request #111 by mstead (2012-11-03 00:33:18+00:00)
Title: Add 'assignee' attribute to PullRequest

It seems as though this may have been added to
the github API and was not being included in the
PullRequest object.

I stumbled upon this when attempting to get the current
assignee of a pull request while playing with the API,
and noticed I could not get it via PyGithub. I need this
for a project I'm working on.

This verifies that the attribute's existence in github's API:
```curl -i "https://api.github.com/repos/jacquev6/PyGithub/pulls/31" | grep assignee```
Output:
```"assignee": null,```

I was also going to update the tests to include the attribute,
but I wasn't able to set the assignee on the test data.