Add required prelude modules

A couple of prelude modules are required by default to use Emacs
effectivly. Modules, which do not add benfit to my work, are still
excluded.
Remove .gitkeep file

After adding files to the personal directory, there is no need to have a
.gitkeep file here.
Revert "Add required prelude modules"

The prelude-modules.el file has to be located in prelude's root
directory. Putting it into the personal directory has no
effect. Selection of modules needs to be done on each machine.
Start Emacs server on start up

Instead of running Emacs as a daemon, starting an Emacs server on start
up, allows an emacsclient from the command line to access the Emacs
instance.

In zsh a simple alias makes access easier `alias e=emacsclient -t`.