This reverts commit fa77a5ac, reversing
changes made to 5843bc4d.

On Fri, Jan 23, 2015 at 04:30:14AM -0800, Matt Burke (GitHub Staff) wrote:
> The importer was supposed to be setting the HEAD ref.  There was a
> race condition that prevented it from doing so in some cases.  I
> just pushed out an update that should fix this issue.  Please let me
> know if it's still not working.

So the issue we were working around with #143 should be fixed now.