Increased priority of excerpt length filter.

git-svn-id: https://plugins.svn.wordpress.org/flexible-recent-posts/trunk@952443 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated version to 1.0.4 and changelog.

git-svn-id: https://plugins.svn.wordpress.org/flexible-recent-posts/trunk@952445 b8457f37-d9ea-0310-8a92-e5e31aec5664