Add VerbosityLevel argument to task

Currently, the task writes with a high priority to the Output. It is giving details at the folder level, so if the package, say bootstrap, has a Scripts, a content and a fonts folder, you will see three lines in your output, one per folder.
I believe it'd be interesting to have three levels: Package, Folder, File. I'd have Folder to be the default and let the users change it.
