Store country names as unicode

On python2 we need to store the country names as unicode
in order to avoid a mismatch on has_country() when the line
has non-ascii characters (eg. aymorecfi.com.br)

Author: Ángel González

pythonwhois/parse.py

@@ -60,7 +60,11 @@ def read_dataset(filename, destination, abbrev_key, name_key, is_dict=False):
 # Because 'UK' is commonly used to refer to the United Kingdom, but formally not the ISO code...
 countries['UK'] = countries['GB']
 
-country_names = set([name.lower() for name in countries.values()])
+if sys.version_info < (3, 0):
+       country_names = set([name.decode('utf-8').lower() for name in countries.values()])
+else:
+       country_names = set([name.lower() for name in countries.values()])
+
 
 def precompile_regexes(source, flags=0):
 	return [re.compile(regex, flags) for regex in source]