Removed unnecessary check for mac-command-modifier.
Renamed .emacs to the standard init.el.

Emacs version 22 (year 2007) and up automatically look for
~/.emacs.d/init.el if no ~/.emacs file is found. I don't need to
symlink the .emacs file in my home directory to a file in my
~/.emacs.d/ directory, and I don't have to call my init file .emacs
(which is invisible to a normal ls). I gave it the standard name used
by modern emacs versions.

Sidenote: the fact that I started using emacs back at version 21
(released in 2001) makes me feel old.