Update to 1.3.1 maintenance release

git-svn-id: https://plugins.svn.wordpress.org/seoslides/trunk@861291 b8457f37-d9ea-0310-8a92-e5e31aec5664
Checking in v 1.3.2 hotfix

git-svn-id: https://plugins.svn.wordpress.org/seoslides/trunk@864216 b8457f37-d9ea-0310-8a92-e5e31aec5664