Write an angular directive for funnies!

Funnies has a raw javascript, react, and jquery bindings. I've had many requests for Angular bindings too.

It's been a while since I used Angular, but I'm pretty sure that we'd want to make a directive called `funnies`, and have it render one of the funny phrases in [here](https://github.com/1egoman/funnies/blob/master/src/funnies.js) (probably in a span with a custom classname so it can be styled). Behind the scenes, you can consume [this](https://github.com/1egoman/funnies/blob/master/src/index.js) api to generate a random funny message to display. Bonus points if you can make the phrase change every couple seconds! 😄

Thanks for your help!