This pull request combined all the patches / threads i could find for making build on windows work.

Just added the PR incase its any help getting the changes in.
The none normalized paths are needed in the win object for pake. 

2014-10-07 19:51:23,141 pake: build/ol.css: Command '['node_modules/.bin/cleancss.cmd', 'css/ol.css']' returned non-zero exit status 1

but other than that everything works with the current paths setup as far as i can see.