Add repository attribute to Pull Destination object

[sigmavirus24]

Here we check to see if there's a 'repo' key in the decoded JSON. We should add self.repository = Repository(...) which uses that data.

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[ministrike3]

Hey sigmavirus,
I'm trying to make my first ever Open Source commit. I understand that we're looking through the JSON that comes back for a 'repo' key, which I looked at on the single pull request github documentation.

EDIT: I read the post title and understand im literally adding an attribute to the Pull Destination Attribute. I think I found it here, can you confirm that im in the right direction, or point me if not? https://github.com/sigmavirus24/github3.py/blob/develop/github3/repos/repo.py

EDIT2: If this is what im supposed to do, I think that im going to be creating a Repository object called self.repository, and the parentheses are for the various traits?

[ministrike3]

self.repository = Repository(self.repository, self)
Would this be the correct line to add, probably at line 48?