Merge branch 'master' into fix_3728_with_file_exists_dialog

Conflicts:
	apps/files/css/files.css
	apps/files/js/file-upload.js
	apps/files/js/filelist.js
	apps/files/js/files.js
	apps/files_sharing/js/public.js
	core/js/jquery.ocdialog.js
	core/js/oc-dialogs.js