Added a --json option taking over the --output json old format. New code
uses facilities provided by Reporter class
Improved help message with new command line options
Removed dry_run call... it's not needed
Huge refactoring. Now dawn script is more readable and the --output flag
was removed.
Now we do honor the -D flag putting engine in debug mode when set.
There is a bug in GemfileLock engine with Owasp RoR Cheatsheet check.
Further investigations needed.