Usability for ralph scan command

`ralph scan` was a garbage previously because of the 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. There are some 'shortcuts' to make output beauty but i didn't find any better way to mark failure plugins.

![zrzut ekranu 2014-03-19 o 22 15 53](https://f.cloud.github.com/assets/552398/2466168/0c30a834-afac-11e3-837a-50fd3276509b.png)