Merge pull request #1031 from owncloud/external_storage_ui_feedback

apps/files_external/ajax/addMountPoint.php

apps/files_external/css/settings.css

apps/files_external/img/error.png

apps/files_external/img/success.png

apps/files_external/img/waiting.png

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/config.php

apps/files_external/lib/ftp.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

apps/files_external/templates/settings.php

lib/files/storage/common.php