[Node] Updating stream interfaces and removing redundant interfaces.

We duplicated the EventEmitter and Stream interfaces in the "event" module, so I removed the redundant interface definitions.

I have updated the ReadableStream/WritableStream interfaces in accordance with the current documentation:
http://nodejs.org/api/stream.html

I added class definitions for Writable/Transform/Duplex/PassThrough in 'event'. These classes are described in the following Node documentation:
http://nodejs.org/api/stream.html#stream_api_for_stream_implementors

As a result of these changes, I needed to slightly alter other typings to refer to the new interface name. This was unavoidable; I had to rename the `EventEmitter` interface to `NodeEventEmitter` to avoid clashing with the `events.EventEmitter` class that implements `NodeEventEmitter`.

through/through.d.ts

@@ -15,7 +15,7 @@ declare module "through" {
 		}): through.ThroughStream;
 
 	module through {
-		export interface ThroughStream extends Stream.ReadWriteStream {
+		export interface ThroughStream extends ReadWriteStream {
 			autoDestroy: boolean;
 		}
 	}