Release of Scala 2.11.0 final.
Remove stray RC reference
Remove HTML comments from release notes

... and mention two recently published libraries for 2.11

Removing comment in 2014-04-08-release-notes-2.11.0-RC4.md was the
minimal change needed to fix the layout bug on the homepage.

I have updated our generator to strip out internal comments
before shipping the markdown your way:

  https://github.com/scala/make-release-notes/pull/86
reorder doc links
Update Activator download link to the latest version.
Clean up the download options, include Activator.
updated release notes
Merge pull request #187 from retronym/release/2.11.0

Release of Scala 2.11.0 final.