robrix/Traversal — pull request #47 by robrix (2014-12-07 23:39:01+00:00)
Title: Appending

- Adds `+` and `+=` over (`ExtensibleCollectionType`, `ReducibleType`).
- Drops `Stream`’s `SequenceType` conformance, which was creating needless ambiguity. Note that this means that to use `Stream` with `for`…`in`, you will now have to wrap it in a call to `sequence`:

```swift
for each in sequence(stream) {
…
}
```

- Fixes #28.