Clean up yum caches #68
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As discussed in #67, it is possible to reduce the size of the docker image by up to 30% by cleaning the yum-caches in the same commands where yum installations are performed.
This PR modifies the Dockerfile to include a yum -y clean-cache and rm -rf /var/cache, to do this clean up.
At the current point in time this decreases the size of the resulting image from 1.29GB to 918 MB.
// Julian