Bundling ZooKeeper sources along with node-zookeeper

Hello,

I'm a maintainer of node-zookeeper (https://github.com/yfinkelstein), we
would like to bundle the ZooKeeper source files with the library.

Currently people are complaining about poor performance of apache mirrors,
sometimes the build process takes couple of minutes because of slow speed
while downloading zookeeper sources.

So we would like to add a tar.gz file with ZK sources to the
node-zookeeper, how does it looks from the licensing perspective?
Node-zookeeper is currently distributed under MIT license.

Thanks.