Renamed NodeStream to Stream

The Stream API is widely used within Node.js, but our usage doesn't
require Node. Non-node API that follow these patterns will work. There
are no functional changes.

- `msgs/adapters/nodeStream`      -> `msgs/adapters/stream`
- bus.inboundNodeStreamAdapter()  -> bus.inboundStreamAdapter()
- bus.outboundNodeStreamAdapter() -> bus.outboundStreamAdapter()
- bus.nodeStreamGateway()         -> bus.streamGateway()