Enable autoplay for better Twitter experience

[futuresoup]

Right now the user is forced to hit play twice to get the video to start. Once from Twitter's static play button, and then again from the popcorn player.

Ideally the user hits play from Twitter and the show begins without requiring a second, and confusing interaction from the Popcorn player.

Example - go here:
https://twitter.com/mikenyc2016

Find some tweets with a popcorn video embed in them, hit the play button. The video should start, but doesn't. Instead user has to hit play again...

[aec1140]

I can take a look a this if no one else has. Should be pretty easy.