Jetpack: JSON API: Add User Nicename to the user data.

git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@766858 b8457f37-d9ea-0310-8a92-e5e31aec5664
Jetpack: Custom CSS: Set the ACE gutter z-index to 1.

git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@766859 b8457f37-d9ea-0310-8a92-e5e31aec5664