Refresh git configuration before looking for the tracking branch.
Revert "Refresh git configuration before looking for the tracking branch."

This reverts commit fc9e3a8b30a512c8d4149b45df48b0fddbea00d5.
++libgit2
Update calls for libgit2 interface changes.
++libgit2
++libgit2 for new PR.
++libgit2
Get the fetch ref specs and pass them to get_remote_fetch.
++libgit2
bump libgit2 to master
Merge pull request #413 from libgit2/fix-tracking-branch

Refresh git configuration before looking for the tracking branch.
Merge remote-tracking branch 'origin/master' into xcode6