Please provide binaries for Windows

[htgoebel]

Having binaries for Windows would heavily ease the use of Radicale for not so experienced users.

You could use py2exe to PyInstaller to create these packages. In the first place you not even need to create an installer, a zip-archive would suffice.

Of course for creating the binary packages you would need a Windows machine. But building could be automated by using e.g. appveyor-ci and even publish the new package at the github-release.

This would become even more interesting when #551 is implemented.