Remove warning about missing libasound.so.2

Author: gllmflndn

matlab/Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:trusty
 MAINTAINER Guillaume Flandin <[email protected]>
 
 RUN apt-get update && \
-    apt-get install -y unzip xorg wget && \
+    apt-get install -y unzip xorg wget libasound2 && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 # Install MATLAB MCR in /opt/mcr/