Use current_user_can('manage_network_plugins') in validate_active_plugins() instead of is_super_admin().

props jdgrimes.
fixes #26068.


git-svn-id: https://develop.svn.wordpress.org/trunk@26590 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: fix JS lint errors in customizer.js file, see r26573.

git-svn-id: https://develop.svn.wordpress.org/trunk@26591 602fd350-edb4-49c9-b593-d223f7449a82
Ensure that theme customizer buttons don't overlap on small screens; allow small-screen theme popup to use the full height of the viewport since the adminmenu is no longer fixed; ensure that buttons in the theme customizer wrap as efficiently as they can on mobile. Fixes #26361, props mattheu, iammattthomas.

git-svn-id: https://develop.svn.wordpress.org/trunk@26592 602fd350-edb4-49c9-b593-d223f7449a82