Do not upgrade to nodejs 4.x, seemingly this messes with python in bad ways.

Dockerfile

@@ -3,12 +3,11 @@ FROM phusion/passenger-nodejs:0.9.17
 # prepare APT with only the repositories we want
 RUN rm /etc/apt/sources.list.d/* &&\
 	add-apt-repository ppa:mc3man/trusty-media -y &&\
-	DEBIAN_FRONTEND=noninteractive curl -sL https://deb.nodesource.com/setup_4.x | bash - &&\
+	apt-get update &&\
 	DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
-		nodejs \
 		blackbox xvfb xdotool \
 		pulseaudio pulseaudio-utils \
-		dbus python-minimal \
+		dbus \
 		vlc vlc-plugin-pulse
 
 # initialize DBus