quieter logging for different config.logLevels 

not completely confident about which levels to omit browser logging from, but it is worth tidying up some of the less verbose logging levels :

![screen shot 2014-07-17 at 12 23 53](https://cloud.githubusercontent.com/assets/1065252/3612086/47dfa126-0da5-11e4-8a6d-f6cd43ba2bf0.png)

vs

![screen shot 2014-07-17 at 12 24 37](https://cloud.githubusercontent.com/assets/1065252/3612088/4c10697e-0da5-11e4-8d3a-8fb2491e5c5e.png)