Port configure script to Node, step 4: build distribution files.
Port configure script to Node, step 4: build distribution files.

This is step 4 of porting our configure script to Node. This version improves
on the previous by no longer needing to execute a shell command to cleanly
extract the name and version for a release.

Progress on #7.

tchiotludo/spfjs,scrapp-uk/spfjs,nicksay/spfjs,nicksay/spfjs,theanh/spfjs,tchiotludo/spfjs,nicksay/spfjs,youtube/spfjs,nicksay/spfjs,tchiotludo/spfjs,theanh/spfjs,theanh/spfjs,youtube/spfjs,scrapp-uk/spfjs,youtube/spfjs,youtube/spfjs,theanh/spfjs,theanh/spfjs,tchiotludo/spfjs,youtube/spfjs,scrapp-uk/spfjs,scrapp-uk/spfjs,tchiotludo/spfjs,scrapp-uk/spfjs,nicksay/spfjs