OutputCollector  alias bug

```
LoadError: load error: red_storm/dsl/output_collector -- java.lang.ClassNotFoundException: backtype/storm/tuple/Tuple
```

I'm not sure why this occurs, but the output_collector alias of :emit_anchor_tuple keeps redstorm from loading for me; with the below change, it runs fine.  (I have not been able to run redstorm's own spec tests due to some bundler problems, but this is reproducable in pry by loading the jars and classes, then `require 'red_storm'.)