Makefile, dev-manual, mega-manual: Added new figure support

Created a new figure for devtool add flow.  Added support
for it in the Makefile.  The figure, as usual, needs to
reside in the figures directory in both the dev-manual and
the mega-manual.

(From yocto-docs rev: 2040a31b806fdade060f7a4182a09673b76db7b3)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/Makefile

@@ -134,6 +134,7 @@ TARFILES = dev-style.css dev-manual.html \
            figures/kernel-overview-1.png figures/kernel-overview-2-generic.png \
            figures/source-repos.png figures/yp-download.png \
            figures/recipe-workflow.png figures/build-workspace-directory.png \
+           figures/devtool-add-flow.png \
            eclipse
 	endif
 
@@ -242,7 +243,7 @@ TARFILES = mega-manual.html mega-style.css figures/yocto-environment.png \
 	figures/sdk-generation.png figures/recipe-workflow.png \
 	figures/build-workspace-directory.png figures/mega-title.png \
 	figures/toaster-title.png figures/hosted-service.png \
-	figures/simple-configuration.png
+	figures/simple-configuration.png figures/devtool-add-flow.png
 	endif
 
 MANUALS = $(DOC)/$(DOC).html