Added option for MP4Box path specification.  Added extension path to extension check.  Added encoding commands output for debug purposes.  Updated to version 3.1.6 with these advanced options and debugging checks.

git-svn-id: https://plugins.svn.wordpress.org/wp-video-posts/trunk@977945 b8457f37-d9ea-0310-8a92-e5e31aec5664