Version 2.22.0, released June 30, 2015

Version 2.21.0, released September 24, 2013

Version 2.20.1, released June 24, 2013

Version 2.20.0, released March 13, 2013

Version 2.19.0, released January 17, 2012

Version 2.18.0, released October 2, 2011

Version 2.16.0, released January 20, 2011

Version 2.15.4, released January 3, 2011

Version 2.15.3, released December 30, 2010

Version 2.15.2, released December 28, 2010