Fetching tarball of a commit

[Sean Farley]

> Daniel:
>
> Thank you very much!  That works perfectly.  BTW, it also works with the
> short hash as well, ala ...
>
> github.setup            MythTV mythtv 9ccfac11f3
>
> To me, if one is pulling a specific Git commit, the version should include
> the date.  Eg:
>
> version             0.25-fixes-20120510
>
> This way, when you update the port to a new commit, just update the date at
> the same time.  Unless, of course, you plan to update multiple times per
> day!  ;)

You know, it's amazing what's already in the ticketing system:

https://trac.macports.org/ticket/33889