[atkmm] Update .gitignore

[Kjell Ahlstedt <kjellahl src gnome org>]

commit e04132e4092a9e53c5f2da09afff1c3b48882fad
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Mon Sep 4 20:08:02 2017 +0200

    Update .gitignore

 .gitignore           |    1 +
 atk/atkmm/.gitignore |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 35ae574..8f52428 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,7 @@ stamp-h?
 /doc/doc-install.pl
 /doc/doc-postprocess.pl
 /doc/doxygen.css
+/doc/doxygen-extra.css
 /doc/tagfile-to-devhelp2.xsl
 
 /MSVC_Net201?/atkmm/atkmm.rc
diff --git a/atk/atkmm/.gitignore b/atk/atkmm/.gitignore
index 24fe577..9b6de93 100644
--- a/atk/atkmm/.gitignore
+++ b/atk/atkmm/.gitignore
@@ -20,6 +20,8 @@
 /object.h
 /objectaccessible.cc
 /objectaccessible.h
+/range.cc
+/range.h
 /relation.cc
 /relation.h
 /relationset.cc