M3u8

* some bug fixes
* adds support to commas on title
* adds support `CLOSED-CAPTIONS`

* adds [`EXT-X-MAP` tag](https://tools.ietf.org/html/draft-pantos-http-live-streaming-21#section-4.3.2.5)

- enables user to send request http header

- **WARN** Changed API: instead of using `m3u8_obj.key` use `m3u8_obj.keys`
- adds multiple keys
- supports SCTE35 cue markers for envivio and elemental

Thanks birme bertothunder acurro

- supports SCTE35 metadata
- supports timeout on `load`

- adds support for double quotes
- fixes multi media

Thanks Prendo93 somsak