Diff and cross-repo diff

Ill check when I get back but I think I did, it's just referring to the same commit on a different branch pre merge. 

> On Dec 9, 2014, at 16:14, Beyang Liu <notifications@github.com> wrote:
> 
> In Godeps/Godeps.json:
> 
> > @@ -170,7 +170,7 @@
> >  		},
> >  		{
> >  			"ImportPath": "github.com/libgit2/git2go",
> > -			"Rev": "520a0425c736c7d584d21d073b08a8735dd2464f"
> > +			"Rev": "7443b062c662753b27e36e3435f966421a475273"
> can you push the latest to go-diff?
> 
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