Blame README.md

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Look at the c7 branch if you are working with CentOS-7, or the c4/c5/c6 branch
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for CentOS-4, 5 or 6. If you find this file in a distro specific branch, it 
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means that no content has been checked in yet
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More information on how these git repositories are setup, is available at 
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http://wiki.centos.org/Sources