Add support for bosrtv.nl

[Meneereke]

http://bosrtv.nl/televisie/....

youtube-dl http://bosrtv.nl/televisie/in-het-spoor-van-nichiren
[generic] in-het-spoor-van-nichiren: Requesting header
WARNING: Falling back on generic information extractor.
[generic] in-het-spoor-van-nichiren: Downloading webpage
[generic] in-het-spoor-van-nichiren: Extracting information
ERROR: Unsupported URL: http://bosrtv.nl/televisie/in-het-spoor-van-nichiren; please report this issue on https://yt-dl.org/bug .

[Reino17]

html-source:

<script> npoplayer("player").setup({ "prid": "VPWON_1245404", "width": "630", "options": {  
"skin": "npo", "channel": "BOS"     } }); </script>

Extract the 'prid', which can then be used with the [NPO]-extractor.