Get six more pieces of metadata from the YouTube page

[k-k-k-ken]

Added: description, (date) published, views, thumbnail (url), familyfriendly, and genre.

[oalders]

Thanks! This is looking really good. Let's see what we need to do to wrap this up.

• You should be able to follow the pattern in t/video_user.t to test the new methods which you have added. There should be at least one test for each new method. Whether you put these all into individual test files or one test file is up to you.
• We should document these changes in the pod for WWW::YouTube::Download.
• An appropriate entry should be added to Changes (I'm happy to handle this, if you like.)

Let me know if you run into any problems with the above and thanks for your efforts. 👍