Support for subtitles in online content plugins

[Former user]

A new subtitleUrl used with contentUrl

i.e.

contentUrl extracted from

file: "http://cdn.sweflix.com/media/new/The.Last.Lions.2011.720p.BrRip.x264.YIFY.mp4"

and

subtitleUrl extracted from

tracks:

    [

, {file: 'https://static2.sweflix.com/srt/The.Last.Lions.2011.LIMITED.720p.BluRay.x264-THUGLiNE..srt', label:'Svenska', kind:'subtitles',}, {file: 'https://static2.sweflix.com/srt/The.Last.Lions.2011.720p.BrRip.x264.YIFY.srt', label:'Engelska', kind:'subtitles',} ]

(From WebResource plugin http://www.sweflix.net)

[Petr Nejedly]

Duplicate of #536.