Allow a string of a path to an audio source to be passed into Dancer constructor, as well as ordered audio types to check support
// Chrome would use /path/to/audio.mp3 while Firefox
// would use the first type that it supports and would load /path/to/audio.ogg
var dancer = new Dancer( "/path/to/audio", [ 'mp3', 'ogg' ] );
Allow a string of a path to an audio source to be passed into Dancer constructor, as well as ordered audio types to check support