Support short youtube URLs

Added the feature request to https://github.com/WebDevStudios/Automatic-Featured-Images-from-Videos/issues/3

Thanks for the suggestion.

Please. I have to switch plugins now because this doesn’t work. ??

It looks like this feature has been finished but is not yet available in the plugin. For now I just manually copied the code from github and edited the plugin, but it is working now Brian.

Gonna try and get the short url fixed version out soon. Stay tuned.