Updating 1.5.2

git-svn-id: https://plugins.svn.wordpress.org/wp-songbook/trunk@1027142 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.5.2

git-svn-id: https://plugins.svn.wordpress.org/wp-songbook/trunk@1027146 b8457f37-d9ea-0310-8a92-e5e31aec5664