Feature/request mirror

fixes #126 

The output handler does slicing and dicing:

```javascript
var outputHandler = function (data) {
        var lines = data.toString().split(/\r?\n/).slice(0, -1);
        _.map(lines, function (line) {
          console.log('[velocity mirror] ' + line);
        });
      };
```

I think it can pipe directly to the parent stream, rather than string manipulation