Scala 2.11.4 release.

you could add
```
permalink: /news/2.11.4
```

we did that in 2.11.2 (918eb6e54f90d585e0b6604508b352e0602e5224) - initially i got it wrong, it was fixed in e3554ba6bd9852c84ab3f20031caf9377789d57b