[pyar] Join URL's

[Esteban Kuber]

http://docs.python.org/library/urlparse.html#urlparse.urljoin ?

>>> from urlparse import urljoin
>>> urljoin('http://www.cwi.nl/%7Eguido/Python.html', 'FAQ.html')
'http://www.cwi.nl/%7Eguido/FAQ.html'