Jetpack: Tagging 2.4.2 release.

git-svn-id: https://plugins.svn.wordpress.org/jetpack/tags/2.4.2@767073 b8457f37-d9ea-0310-8a92-e5e31aec5664
2.4.3


git-svn-id: https://plugins.svn.wordpress.org/jetpack/tags/2.4.3@890448 b8457f37-d9ea-0310-8a92-e5e31aec5664
`get_userdata()` isn't always defined.


git-svn-id: https://plugins.svn.wordpress.org/jetpack/branches/2.4@890496 b8457f37-d9ea-0310-8a92-e5e31aec5664