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script to check softwares are installed or not, before trying out tutorial
before we do run make demo-*, a single script to check following :
1: Check whether you have vagrant installer or not. (version > some basic working version of vagrant say 1.8.x) 2: Check whether you have installed Virtualbox or not ? 3: Check whether you have installed docker-engine and its running or not. 4: Check if git is present or not.