* Added support to list command to list roots. Closes issue #30.
* Updated man page with regard to list options.
* Updated help on list command.
* Fixed a formatting issue with list + no targets
* Added unit test for list + no targets. Closes issue #33.
* Removed some commented code. Can't remember why I left it in...
* Modified SCAN subcommand to only generate one summary at the end instead of one summary per target. Closes issue #16.