Fixed more strict notices in PHP 5.4+. Updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/drop-shadow-boxes/trunk@904807 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated version number

git-svn-id: https://plugins.svn.wordpress.org/drop-shadow-boxes/trunk@904809 b8457f37-d9ea-0310-8a92-e5e31aec5664