Added support for Opus audio with content type audio/ogg.


Files with 'ogg' file extension are now treated as audio/ogg, unless the following define is added to your wp-config.php: `define('POWERPRESS_OGG_VIDEO', true);`

git-svn-id: https://plugins.svn.wordpress.org/powerpress/trunk@976572 b8457f37-d9ea-0310-8a92-e5e31aec5664