add pulseaudio

Signed-off-by: Jessica Frazelle <princess@docker.com>

skype/Dockerfile

@@ -1,9 +1,10 @@
-# Run skype in a container
+# Run skype in a container, requires pulseaudio
+# (but I have a container for that)
 #
 # docker run -v /tmp/.X11-unix:/tmp/.X11-unix \
 #	-v /dev/snd:/dev/snd \
 #	-e DISPLAY=unix$DISPLAY \
-#	-e PULSE_SERVER=$(ip addr show eth0  | awk '/inet/ {print $2}' | cut -d/ -f1 |head -1) \ # or however you get your local address
+#	--link pulseaudio \
 #	jess/skype
 #
 FROM debian:jessie