'Based on different files and user configurations, generate the URLs that
need to be tested.
:return: URLs'

def _url_generator(self, base_url, extensions, wordlist):

    for ext in extensions:
        for word in file(wordlist):
            manifest_url = base_url.url_join((word.strip() + ext))
            (yield manifest_url)
    cross_domain_url = base_url.url_join('crossdomain.xml')
    (yield cross_domain_url)
    client_access_url = base_url.url_join('clientaccesspolicy.xml')
    (yield client_access_url)
