Define github-with-auth-info before it is used.

This makes the gist.el functions requiring github authentication
*work* when gist.el is autoloaded by emacs, e.g. when gist.el is
installed from ELPA.

gist.el

@@ -84,6 +84,14 @@ posted.")
 
 
 
+(defmacro github-with-auth-info (login token &rest body)
+  "Binds the github authentication credentials to `login' and `token'.
+The credentials are retrieved at most once within the body of this macro."
+  (declare (indent 2))
+  `(let ((*github-auth-info* (github-auth-info)))
+     (destructuring-bind (,login . ,token) *github-auth-info*
+       ,@body)))
+
 (defun* gist-request (url callback &optional params)
   "Makes a request to `url' asynchronously, notifying `callback' when
 complete. The github parameters are included in the request. Optionally
@@ -181,14 +189,6 @@ for the info then sets it to the git config."
 
       (cons user token))))
 
-(defmacro github-with-auth-info (login token &rest body)
-  "Binds the github authentication credentials to `login' and `token'.
-The credentials are retrieved at most once within the body of this macro."
-  (declare (indent 2))
-  `(let ((*github-auth-info* (github-auth-info)))
-     (destructuring-bind (,login . ,token) *github-auth-info*
-       ,@body)))
-
 ;;;###autoload
 (defun gist-buffer (&optional private)
   "Post the current buffer as a new paste at gist.github.com.
@@ -343,4 +343,4 @@ If the Gist already exists in a buffer, switches to it"
         (switch-to-buffer-other-window gist-buffer)))))
 
 (provide 'gist)
-;;; gist.el ends here.
+;;; gist.el ends here.