Mesos on Windows

The ultimate goal of this is to have all containerizer tests running and passing on Windows Server.

1. It must build (see MESOS-898).
2. All OS-specific code (that is touched by the containerizer) must be ported to Windows.
3. The containizer itself must be ported to Windows, alongside the MesosContainerizer.

Note: Isolation (cgroups) will probably not exist on Windows.