you need to edit your robots.txt file. this seems to be something new for google to care about.
here is an example of the robots.txt you will need, just edit the one you have an put the allow lines in.
User-agent: *
Disallow: /cgi-bin/
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/cache/
Allow: /wp-content/themes/
Allow: /wp-content/plugins/
Allow: /wp-content/uploads/
Allow: /wp-includes/css/
Allow: /wp-includes/js/
Allow: /wp-includes/images/
