Make clicking on the pushlog link from a try revision take you to the try pushlog

[sethfowler]

Currently, AWSY assumes that revisions are from mozilla-inbound, so clicking on the pushlog link from a try revision doesn't work. It takes you to the mozilla-inbound pushlog for that revision, which almost certainly doesn't exist.

[EricRahm]

We now track the source repo in the json file, so in theory this should be reasonably straightforward.

[EricRahm]

Well not that easy, we'd have to update mkHgLink to take a repo, but we'd also have go pretty deep to propagate the value up to that function.