Add verbosity levels

[amureki]

In my usecase, I am defining rule with an extensive hint. While it might make sense to show it in majority of the cases, maybe sometimes in a known set of rules I just need to know which rule failed without the detailed description.
I could imagine it this way:

relint myfile.py

1>    myfile.py:12 relint rule name
2>    myfile.py:17 relint second rule name


~~~

relint myfile.py --verbose

1>    myfile.py:12 relint rule name
Hint: extensive rule description for multiple lines

2>    myfile.py:17 relint second rule name
Hint: another extensive rule description for multiple lines

[codingjoe]

Excellent idea @amureki. Go for it!