Merge branch 'master' into external_storage_ui_feedback

Conflicts:
	apps/files_external/js/dropbox.js
	apps/files_external/js/google.js
	apps/files_external/js/settings.js
	apps/files_external/lib/amazons3.php
	apps/files_external/lib/dropbox.php
	apps/files_external/lib/google.php
	apps/files_external/lib/smb.php
	apps/files_external/lib/swift.php
	apps/files_external/lib/webdav.php
	lib/filestorage.php