.emacs: Remove `.el` suffixes from load() calls.

.emacs: Remove `.el` suffixes from load() calls.

Emacs expects the given name to not have an extension, and adds a
range of possible extensions to find the file [1]:

  Function: load filename &optional missing-ok nomessage nosuffix must-suffix
  ...
  To find the file, load first looks for a file named filename.elc,
  that is, for a file whose name is filename with the extension ‘.elc’
  appended. If such a file exists, it is loaded. If there is no file
  by that name, then load looks for a file named filename.el. If that
  file exists, it is loaded. Finally, if neither of those names is
  found, load looks for a file named filename with nothing appended,
  and loads it if it exists.

[1]: http://www.gnu.org/software/emacs/manual/html_node/elisp/How-Programs-Do-Loading.html#index-load-826