Buildbot work

[Nick Schermer]

A small update:

FreeBSD slave is now working using gcc. I keep it that way (no clang)
because it already unveiled a couple or warnings. One of the Linux
bots can probably compile both gcc and clang by running 2 slaves, so I
will try that instead.

Auto rebuilds by git commits is partly working. The setup is ready on
the build server, just need need to add the script to the git hooks
(which needs some changes compared to the old try).
As you can see (I manually pushed some changes) this will also fill
the console (http://buildbot.xfce.org/console) and builds
(http://buildbot.xfce.org/builders/terminal-i686/builds/7) with
changes information as changes in the waterfall view.

Nick