adds support for youtu.be style links

[whoisgregg]

Allows for the use of shortened youtu.be style links, such as:

• https://youtu.be/et8xNAc2ic8

[nicgordon]

I need this functionality too @whoisgregg, but you'll need to add your code to src/js/iframe.js and then compile it down to the files in the dist folder that you've edited here.

[whoisgregg]

@nicgordon I believe I've done what you suggested. I appreciate any feedback you have if this pull request still needs work. :)

[nicgordon]

Yep, this is great @whoisgregg. Thanks for that. Let's hope it gets merged soon!