Improve windows rm_recursive with better errors, and to retry without using 100% cpu
Switch to a Uname of "Windows"
Use uname of "Windows" in warehouse
First cut of js build-release (still includes comments)
More switching of uname to 'Windows'
Remove need for meteor_get_ready.bat by emulating the .git behaviour of the unix meteor script.

Also tidy up instructions a little.
Tidy up the build-release.js script now it works
Switch to crypto for sha1 & full sha1 in packages
Fix double slashes with %~dp0 and use setlocal
Avoid using real symlinks/junctions in the bundle on windows.

They're only used in a couple of places:
- for the core node_modules, but NODE_PATH is set, so that isn't needed.
- for nested NPM package dependencies

For the package dependencies, use a simple text file instead of a
symlink
and do an explicit check and redirect in server.js if needed.
Add quotes for more portable bat file