How to delete a protected EFI disk partition with Windows 7 or 8 or 8.1

I recently bought a MAC Mini for development purposes and learning cross-platform / Xamarin development. Being windows / linux user for a quite long time now, I haven't ever touched or operated MAC OS before (I know, shame on me). So I have no prior experience with MAC world what so ever. In excitement, I opted for beta testing for early release of MAC OSX - Yosemite and was happy to use it. But when I experienced that my Xcode and Xamarin studio started breaking and acted weirdly, I decided » Read more