ChangeLog fix

Ref: http://lists.gnu.org/archive/html/emacs-orgmode/2014-01/msg00165.html
http://orgmode.org/w/?p=org-mode.git;a=commitdiff;h=65cf7047bf885959a5e03b5aa9346b55a600fcab
Small authors.el updates

* lisp/emacs-lisp/authors.el (authors-aliases, authors-fixed-case)
(authors-obsolete-files-regexps): Additions.
(authors-no-scan-regexps): New constant.
(authors-no-scan-file-p): New function.
(authors): Respect authors-no-scan-file-p.