Revert "Revert "Threadpool tested.""
Revert "Revert "Threadpool tested.""

This reverts commit 03db44f85088ae8c451d2381c190e961714afbbd

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