Tests for unicode_content inside response

Tested unicode_content value whether charset is set or not.

Signed-off-by: Alexandre Barbosa <alexandreab@live.com>
Signed-off-by: Carlos Oliveira <carlospecter@gmail.com>
Probably the best approach where would be to mock our class revproxy.utils.HTTPRedirectHandler. When we call urllib2.urlopen(...) we are actually calling build_opener(HTTPRedirectHandler).open(...)