LoDash*Wrapper.map() returns mapped result type
[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`.
Update SinonJS Definitions to 1.8.1
Update Mocha Definitions to 1.17.1
Update Test to remove global var as defined in Definitions
Merge pull request #1666 from jvilk/node-fixes-3

[Node] Updating stream interfaces and removing redundant interfaces.
Merge pull request #1669 from SomaticIT/update-mocha

Update Mocha Definitions to 1.17.1
Merge pull request #1667 from SomaticIT/update-sinon

Update SinonJS Definitions to 1.8.1
Merge pull request #1662 from davidsidlinger/fix/lodash-wrapper-map-result

Fix up lodash wrapper map