Issue: #398 [BUG] CMI export options for views/layouts are not available...

... for single export as configuration
These views do not need to be individually specified. We should just declare:
```
$prefixes['views.view'] = array(
  'name_key' => 'name',
  'title_key' => 'human_name',
  'group' => t('Views'),
);
```

And then everything that is prefixed with "views.view" will be listed in a select list under "Views" for export. Image styles and (the just added) node types behave this way.