1.0.4 release with Spanish + Serbian translations

git-svn-id: https://plugins.svn.wordpress.org/google-pagespeed-insights/trunk@921273 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixing readme formatting

git-svn-id: https://plugins.svn.wordpress.org/google-pagespeed-insights/trunk@921274 b8457f37-d9ea-0310-8a92-e5e31aec5664