Move *.el files to `.emacs.d/lisp` directory as per emacs 24.4 suggestion.

warning in emacs 24.4:
Warning (initialization): Your `load-path' seems to contain
your `.emacs.d' directory: ~/.emacs.d/
This is likely to cause problems...
Consider using a subdirectory instead, e.g.: /home/mbezjak/.emacs.d/lisp

refs:
- http://stackoverflow.com/questions/24779041/disable-warning-about-emacs-d-in-load-path