Add fun plugins!

Cowsay - Prints a cowsay ascii art image with the phrase provided.
FerengiRules - Prints a random ferengi rule of acquisition. (also listens for various Ferengi key words like money, profit, opportunity, etc)
ChuckNorris - Prints a random Chuck Norris joke. (also listens for someone invoking Chucks name in conversation)
RedditJoke - Prints a random joke from Reddit.

```
19:38 < rwjblue> .help
19:38 < Turbot_> .rule of aqcuisition = Print a random Ferengi rule of acquisition.
19:38 < Turbot_> .cowsay Bovine Phrase = Awesome Cowsay Graphic
19:38 < Turbot_> .chuck norris = Rockin' Norris Quote
19:38 < Turbot_> .chuck says = Rockin' Norris Quote
19:38 < Turbot_> .chuck = Rockin' Norris Quote
19:38 < Turbot_> .joke me = Random joke from reddit.com/r/jokes
19:39 < Turbot_> .joke = Random joke from reddit.com/r/jokes
```