Load markdown-mode for .mdwn files, don't remove whitespace when
markdown-mode is active and enable whitespace-mode and auto-fill-mode
for markdown-mode.
* .emacs only loops through .emacs.d and runs the *.el files there.
* files are automatically compiled before loading. But only if it
hasn't already been compiled.
* all emacs el files, save for the startup scripts, have been moved
to .emacs.d/elisp