more work on install.js. It now also builds native node module.
more work on install.js. It now also builds native node module.

DerpKitten/node-sgit,libgit2/node-gitteh,DerpKitten/node-sgit,beni55/node-gitteh,DerpKitten/node-sgit,beni55/node-gitteh,DerpKitten/node-sgit,beni55/node-gitteh,libgit2/node-gitteh,beni55/node-gitteh,libgit2/node-gitteh,libgit2/node-gitteh