Commit announcements for 4.7

Happy 4.6 release day! Commit announcements for 4.7 are brief.

Andrea Fercia (@afercia) is now a permanent committer. Andrea’s work with and on the accessibility team has helped WordPress make huge strides forward, and he’s wielded his commit powers quite effectively over the past few releases. Please join me in congratulating Andrea. 🎉

All other guest committers have been renewed for the cycle. Looking forward to 4.7!