Move to 2.11.2 and various small cleanups for the download pages.

Yeah, but if this is "Scala IDE", how are the others still relevant ? (it's like [those](http://blog.ivman.com/wp-content/ToutesAutresDirections.jpg) "All directions" / "Other directions" signs)

I'd vote for "Full Scala IDE" vs "Latest Stable as a plugin", "Latest Stable as a plugin", ...
or "Latest Stable as an Eclipse plugin" ...