Usability for ralph scan command

`ralph scan` was a garbage previously because of debugging input. The user could get it as an error (Exception  in plugin...). If you still want to show debugging input you could use ralph scan [] --verbose=true as well.

![zrzut ekranu 2014-03-19 o 22 15 53](https://f.cloud.github.com/assets/552398/2466168/0c30a834-afac-11e3-837a-50fd3276509b.png)