Exception on #EXT-X-MEDIA-TIME tag

[ost12666]

We have a vtt playlist with non standard #EXT-X-MEDIA-TIME tag:

#EXT-X-MEDIA-TIME:0.0

The parser then tries to parse the attributes from "-TIME:0.0" probably because it somehow detects this as the #EXT-X-MEDIA tag.

This causes this exception here: attr = /([^=]*)=(.*)/.exec(attrs[i]).slice(1);

Exception has occurred: TypeError
TypeError: Cannot read property 'slice' of null
at parseAttributes (/Users/ost/Development/adaptive_playground/Server/node_modules/m3u8-parser/es5/parse-stream.js:60:41)
at ParseStream.push (/Users/ost/Development/adaptive_playground/Server/node_modules/m3u8-parser/es5/parse-stream.js:339:30)
at LineStream. (/Users/ost/Development/adaptive_playground/Server/node_modules/m3u8-parser/es5/stream.js:124:21)
at LineStream.trigger (/Users/ost/Development/adaptive_playground/Server/node_modules/m3u8-parser/es5/stream.js:91:24)
at LineStream.push (/Users/ost/Development/adaptive_playground/Server/node_modules/m3u8-parser/es5/line-stream.js:59:14)
at Parser.push (/Users/ost/Development/adaptive_playground/Server/node_modules/m3u8-parser/es5/parser.js:370:23)

Probably because of the unneeded '?' after the ':'

  match = /^#EXT-X-MEDIA:?(.*)$/.exec(line);

[ost12666]

This still happens

[ost12666]

Can someone review and merge this simple PR? #45

Thanks!

[ost12666]

Fixed here: #50