Reporters not working as expected

I'm not very familiar with all possible testacular config options, I was trying to make
the 'growl' reporter to work and figured out the config should have a `reporters` instead of `reporter` options and the value should be an array (according to [testacular docs](https://github.com/testacular/testacular/blob/master/test/client/testacular.conf.js#L30), at least)