version 1.0.3 stable

git-svn-id: https://plugins.svn.wordpress.org/book-previewer/trunk@994340 b8457f37-d9ea-0310-8a92-e5e31aec5664
added index.php to lang folder

git-svn-id: https://plugins.svn.wordpress.org/book-previewer/trunk@994341 b8457f37-d9ea-0310-8a92-e5e31aec5664