Please start commit message with port name.

[Sean Farley]

Vincent Habchi writes:

> Ciao Petr,
>
>> I'd like to propose to start commit messages with the port name. This helps very much to read them for example in the Timeline.
>> 
>> For example:
>> 
>> https://trac.macports.org/changeset/127794 -- Correct various bugs. Bump to revision 1.
>> https://trac.macports.org/changeset/127795 -- Bump to version 2.1.4
>> 
>> could become:
>> 
>> - gdal: Correct various bugs. Bump to revision 1.
>> and
>> - postgis2: Bump to version 2.1.4
>> respectively.
>
> Fine. Ottima idea. 
> Thanks for the suggestion!

Small nit: I think it's easier to read one-liners when they are all
lowercase:

gdal: correct various bugs and bump revision
postgis2: bump to version 2.1.4

Just my two cents.