Throw err on req 

Hey running this code with your test 
```js
var mma = require('mma');
mma.fighter("Jon Jones", function(data) { console.log(data)});
```
Is returning
```
home/danielokita/Scripts/mma/node_modules/request/index.js:44
    throw new Error('undefined is not a valid uri or options object.')
 ```

Il try and go in and fix it but just letting you know