Add to Default TechOrder

The plugin now registers itself with VideoJS as a default tech order option.
Can you switch this to `unshift()`? Ideally, HLS would be used if the provided sources were:
```js
[{ 
  src: "movie.m3u8", type: "application/x-mpegURL" 
}, {
  src: "movie.mp4", type: "video/mp4"
}]
```
Also, we need to double-check that the HLS tech is not used if native HLS is available through the HTML tech.