Adding new version 1.3

git-svn-id: https://plugins.svn.wordpress.org/page-transition/trunk@990075 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating description in readme.txt

git-svn-id: https://plugins.svn.wordpress.org/page-transition/trunk@990085 b8457f37-d9ea-0310-8a92-e5e31aec5664