[gtkmm-documentation] Add the Revealer example to the build

[Murray Cumming <murrayc src gnome org>]

commit 3126dd01ad3f29c2e55f6c77fd39b2f764a8e15a
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Aug 7 22:53:19 2013 +0200

    Add the Revealer example to the build

 examples/Makefile.am |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/examples/Makefile.am b/examples/Makefile.am
index a1ad851..87a0d32 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -82,6 +82,7 @@ check_PROGRAMS =                                      \
        book/progressbar/example                        \
        book/range_widgets/example                      \
        book/recent_files/example                       \
+       book/revealer/example                           \
        book/scrolledwindow/example                     \
        book/signals/custom/example                     \
        book/socket/plug                                \
@@ -529,6 +530,11 @@ book_recent_files_example_SOURCES =                \
        book/recent_files/examplewindow.h       \
        book/recent_files/main.cc
 
+book_revealer_example_SOURCES =                \
+       book/revealer/examplewindow.cc  \
+       book/revealer/examplewindow.h   \
+       book/revealer/main.cc
+
 book_scrolledwindow_example_SOURCES =          \
        book/scrolledwindow/examplewindow.cc    \
        book/scrolledwindow/examplewindow.h     \