Fix typos in strings
Check "ref" also on "Strada Comunale"
Check if "ref" is present also on SC (Strada Comunale) and SR (Strada regionale)
Make the "no_ref" check case insensitive
Check for names composed only of upper case or lower case letters
Merge pull request #2 from dforsi/master

Check also for ref in "Strada Comunale" and "Strada Regionale" and trivial string fixes