Filters added to allow users to modify slide output

git-svn-id: https://plugins.svn.wordpress.org/ml-slider/trunk@769179 b8457f37-d9ea-0310-8a92-e5e31aec5664
Scoped attribute removed, see readme

git-svn-id: https://plugins.svn.wordpress.org/ml-slider/trunk@769181 b8457f37-d9ea-0310-8a92-e5e31aec5664