Bump up to to Play 2.2.2.
Added release note for 2.1.1.
Added release note for 2.1.2.
Fixed a typo in 2.1.1 release note.
Added release note for 2.1.3, and make it to show in the landing page.
Added 2.1.1, 2.1.2 and 2.1.3 to Download page.
Added 2.1.1, 2.1.2 and 2.1.3 to ScalaDoc page.
Updated build instructions in About page.
Merge branch '2.1.x-update' of https://github.com/cheeseng/scalautils-website
Changed "latest" version numbers to 2.1.3 in Application.