Support for Windows

[elijh]

Add support for running amber server on windows. I think no need to support amber rebuild on windows, because windows doesn't have symlinks and so it is fundamentally not really compatible with how amber works. But the server would be nice for letting people edit pages on windows.

[symbolic]

Maybe amber does not support for Windows platform.
For working better, I would install dual-OS.

[set]

Sorry, Crystal Lang does not support for Windows, because of Amber does not support for Windows.