There are three different ways to setup a system: by RPM, by a Virtual Machine and from Source Code. The first two are recommended. Setting up from GIT is useful if you want to make changes in the code and contribute to github.
For CentOS 7 (RHEL 7)
Note: complete install runs in 13min on a blank CentOS 7 VM.
We will provide a ready VM soon..
See: 3. From Source Code Link