use regex to recognize roman numeral suffixes

[derek73]

Roman numerals that occur after the name are currently recognized by putting the strings in the SUFFIXES constant. This works, but the regex below would recognize more variations of roman numbers.

("roman_numeral", re.compile(r'^(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$', re.I | re.U)),

The regex is currently in the REGEXES constant but not being used. Since the naming convention is pretty archaic and mostly reserved for kings, probably won't get around to it unless someone would find it useful.