Bump version to 0.95-dev, tweak exports, NEWS entries.

NEWS.md

+## Changes for 0.9.5-dev (20xx):
+
+* Coleslaw now exports a `get-updated-files` function which can be
+  used to get a list of file-status/file-name pairs that were changed
+  in the last git push.
+
 ## Changes for 0.9.4 (2014-05-05):
 
 * **SITE-BREAKING CHANGE**: Coleslaw now supports user-defined routing.

coleslaw.asd

 (defsystem #:coleslaw
   :name "coleslaw"
   :description "Flexible Lisp Blogware"
-  :version "0.9.4"
+  :version "0.9.5-dev"
   :license "BSD"
   :author "Brit Butler <redline6561@gmail.com>"
   :pathname "src/"

src/packages.lisp

   (:export #:main
            #:preview
            #:*config*
-           #:*last-revision*
            #:content
            #:post
            #:index

src/util.lisp

                    :external-format '(:utf-8))
     (write text :stream out :escape nil)))
 
-(defun get-updated-files (revision)
+(defun get-updated-files (&optional (revision *last-revision*))
   "Return a plist of (file-status file-name) for files that were changed
 in the git repo since REVISION."
   (flet ((split-on-whitespace (str)