Changed hooks min priority to make them always positive.Removed unsetting of dependencies of excluded scripts.

git-svn-id: https://plugins.svn.wordpress.org/async-js-and-css/trunk@786473 b8457f37-d9ea-0310-8a92-e5e31aec5664
Better dependencies list build.

git-svn-id: https://plugins.svn.wordpress.org/async-js-and-css/trunk@786594 b8457f37-d9ea-0310-8a92-e5e31aec5664