2.11.0-M8 announcement

Markdown generated with:

```
sbt -Dfile.encoding=UTF-8 console
scala> MakeReleaseNotes.genPR("2.11.0-M7", "2.11.0-M8", "2014/01/28")
```

sanity checked (after sudo gem install maruku): `maruku --html 2014-01-28-release-notes-2.11.0-M8.md`