Packaging coffeescript and use bin

@imlucas 
Completed packaging coffeescript as specified in #5 and used bin #3.
To make the former "cli.js" work, I changed the require path as such. I'm not quite sure it looks good though it works.
```js
var infer = require('../lib/fields');
var files = es.merge(fs.createReadStream(__dirname + '/../examples/test.json'));
```
Thanks!