Buildbot updated

I've now configured the Buildbot to pull from the Git repository.

The main difference now is that it will build all branches, which is
pretty nice, since you can now check your branch by simply pushing it
upstream. The problem is that Buildbot's web status is pretty weak when
it comes to make sense of it all, as it does not display branch names on
most pages. I think the only overview page which does it is the "Grid":

http://randomsample.de:4455/grid

The other pages can at least be filtered by branch:

http://randomsample.de:4455/waterfall?branch=obsolete-eieio

http://randomsample.de:4455/waterfall?branch=master (currently none)

As you can see, we currently have problems with emacs-devel, which is
probably due to changes in hideif there. Also, we need to remove usage
of 'cl-symbol-macrolet', as it isn't available in Emacs 24.1.

I've removed the builders for Emacs23.x, as we do not support it
anymore.

-David

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