Revert "Add .npmignore to override excluding build/"
Revert "Add .npmignore to override excluding build/"

This reverts commit 6f5ca1a71bd5d5df1fb75c77dcd9d93477ab4e33.

jamesalley/pure-site,yahoo/pure-site,jamesalley/pure-site,weigang992003/pure-css-chinese,weigang992003/pure-css-chinese,yahoo/pure-site