Fixes for running veewee on Windows 

A few more docs tweaks for windows, and making the switch to use `archive-tar-minitar`.

The other thing that was wacky on windows: the path sent to the `wget.vbs` script was something like `http://IP:port/C:/stuff/filename`, which exploded badly.

You'll want to look a little closer at that one commit to see if it looks okay to you, it looks to me like each WEBrick instance is only serving one file, intentionally... so I just made it serve the file at `/`. Simpler, but could have consequences I'm not seeing.

That key commit is here: https://github.com/dgfitch/veewee/commit/66e8545438eb9370cdcae0cc56d815c3ce65c350