Tagging Jetpack 1.4.2 for release.



git-svn-id: http://plugins.svn.wordpress.org/jetpack/branches/highlander@561187 b8457f37-d9ea-0310-8a92-e5e31aec5664
Release Jetpack 1.4.2.



git-svn-id: http://plugins.svn.wordpress.org/jetpack/branches/highlander@561191 b8457f37-d9ea-0310-8a92-e5e31aec5664