Updated credits and tested on WP 3.8

git-svn-id: https://plugins.svn.wordpress.org/wp-furigana/trunk@823419 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated tags and FAQ

git-svn-id: https://plugins.svn.wordpress.org/wp-furigana/trunk@823424 b8457f37-d9ea-0310-8a92-e5e31aec5664