[adultswim] Add support for trailers

[mattl]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like that [x])
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.08.01. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2016.08.01

Before submitting an issue make sure you have:

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

Seems like they've changed something again.

$ youtube-dl --verbose http://www.adultswim.com/videos/decker/inside-decker-a-new-hero/
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--verbose', u'http://www.adultswim.com/videos/decker/inside-decker-a-new-hero/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.08.01
[debug] Python version 2.7.6 - Linux-3.16.0-57-generic-x86_64-with-Ubuntu-14.04-trusty
[debug] exe versions: ffmpeg N-77455-g4707497, ffprobe N-77455-g4707497, rtmpdump 2.4
[debug] Proxy map: {}
[AdultSwim] inside-decker-a-new-hero: Downloading webpage
ERROR: Unable to find video info; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 682, in extract_info
ie_result = ie.extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 347, in extract
return self._real_extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/adultswim.py", line 137, in _real_extract
raise ExtractorError('Unable to find video info')

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

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Description of your issue, suggested solution and other information

Can't download videos from adultswim.com -- I tried a couple different URLs, but http://www.adultswim.com/videos/decker/inside-decker-a-new-hero/ is the only I'm trying to archive.

[mattl]

@dstftw I don't believe it is a trailer, it should be a bonus show 10-15 minutes in length about the series, Decker.