initial commit: html5_video_cue_sheet_generator for youtube

based on:
    https://github.com/warren-bank/html5_video_cue_sheet_generator/tree/11845c8f7e218284610f49a265f0394220c28647

rather than embedding an html5 video tag,
the script works in combination with the Youtube IFrame API
to embed youtube-hosted videos into page elements using iframes.

all the same playlist functionality is provided.
the setup and configuration is identical.

the only difference in the settings object is a "video" block
of subsettings that are passed to the youtube API during player initialization.
The settings are passed verbatim, so you have as much control as you like.
And if you don't like my defaults (in the plugin).. change them;
(just don't yell at me if you ever update versions and lose them!).