Multi-part last names following prefix #23

The parser doesn't appear to capture multi-part last names following a prefix, such as

Pennie von Bergen Wessel

Any strings following a prefix should be classified as a last name, not a middle name as below:

[u'wessels', u'pennie']
{'C': <Constants() instance>,
'ENCODING': u'utf-8',
'_full_name': u'pennie von bergen wessels',
'count': 0,
'first_list': [u'pennie'],
'last_list': [u'wessels'],
'middle_list': [u'von bergen'],
'nickname_list': [],
'original': u'pennie von bergen wessels',
'string_format': None,
'suffix_list': [],
'title_list': [],
'unparsable': False}