Need to specify the shm-size for docker

[rdavidson]

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First off thanks for the docker file. It has really saved me a lot of time, while truing to get Kaldi up and running quickly. I tried the practical end to end example, but I keep getting a 'No decoder found' when I uploaded a file to the master. I solved this by setting --shm-size=256m on the docker run command. I am not sure if this should be part of the instructions by default, or maybe part of a troubleshooting section, but I thought it would be helpful.

[rdavidson]

This might be the same issue as https://github.com/jcsilva/docker-kaldi-gstreamer-server/issues/4