[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`.

msnodesql/msnodesql.d.ts

@@ -55,5 +55,5 @@ declare module "msnodesql" {
         close(immediately: boolean, callback?: ErrorCallback);
     }
 
-    interface StreamEvents extends EventEmitter { }
+    interface StreamEvents extends NodeEventEmitter { }
 }