Three small changes (copyright, template.js copyright, and tildetidy target)

a.) Cleaned up copyright language to match conventions.
(I used the memoir document class documentation as a reference, but
 these conventions are common throughout publishing)

   * The (c) symbol has no legal meaning. Only the word "Copyright" and
     an encircled lowercase c are appropriate. So the word "Copyright"
     was placed before each (c).

   * Each (C) was changed to (c).

   * Kris uses the correct symbols in copyright notices, but those
     symbols can be problematic in terminal-mode editors. Added the word
     "Copyright" as well.

   * Replaced colons/spaces after years with the word "by."

b.) Added a copyright notice to common/content/template.js. It was
    missing one entirely. Please correct if it doesn't need one or if the
    copyright isn't held by Martin.

c.) Also added a "tildetidy" target to Makefile common that includes a
    version of the find line from the existing "clean" target (however,
    this version uses "rm -fv" instead of "rm -f").

common/content/style.js

@@ -1,5 +1,5 @@
 /***** BEGIN LICENSE BLOCK ***** {{{
- ©2008-2009 Kris Maglione <maglione.k at Gmail>
+ Copyright © 2008-2009 by Kris Maglione <maglione.k at Gmail>
  Distributable under the terms of the MIT license, which allows
  for sublicensing under any compatible license, including the MPL,
  GPL, and MPL. Anyone who changes this file is welcome to relicense