Keep commit message header short

[Tim Rice]

Hey reed,

>I could see the extra information being useful, so I personally like your
>alternative solution:
>
>> An alternative solution would be to move the extra long parts of the
>commit message onto a lower line, so that only people using --pretty=full
>or so would see it.

No worries, I can look at making a patch which will do this. Thanks for the feedback.

~ Tim