Add swarm to official images.

Signed-off-by: Andrea Luzzardi <[email protected]>

library/swarm

@@ -0,0 +1,5 @@
+# maintainer: Andrea Luzzardi <[email protected]> (@aluzzardi)
+# maintainer: Victor Vieux <[email protected]> (@vieux)
+
+0.1.0-rc3: git://github.com/docker/swarm-library-image@c0f8204b2a1bb34233cd2144df51a4de9572440c
+latest: git://github.com/docker/swarm-library-image@c0f8204b2a1bb34233cd2144df51a4de9572440c