Added JSON render to Videos Controller

Hey, I added the JSON render formatting, however, I can't get the app to run on my local server b/c there's some issue with bundling the 'pg' gem on my system ... hours searching on SO didn't help, so I wasn't able to verify how it works locally on my machine.

Let me know if it renders properly on your end. Also, I found I have a Youtube username under 'antimatterbones' if you want to add me as a user or whatever.

Let me know if this works out.