Ignore default Emacs server auth dir

The server-auth-dir is where Emacs stores authentication files for Emacs
servers (running over TCP). These are (usually) ephemeral in nature, and
should be ignored.

Global/Emacs.gitignore

@@ -30,3 +30,6 @@ tramp
 
 # cask packages
 .cask/
+
+# server auth directory
+/server/