Cleaner newbie experience

As new people decide to check out Pash, I want the initial experience to be as smooth and easy as possible.

Some sources of complexity:

- 3 platforms (Windows, Mac, Linux)

- 2 development systems (Visual Studio, Xamarin Studio/MonoDevelop)

- 3 build systems (MSBuild, XS/MD's built-in system, xbuild)

- Mac & Linux users are likely to be unfamiliar with the Windows/Visual Studio/.Net/C# way of doing things.