Add suppport for logging HTTP requests

[olberger]

When things go wrong, it helps to be able to debug the HTTP requests taking place.

I think it would be great to have a mean to set a debug flag so as to get a log.

For the moment, I've patched the code to get
self.opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(wiki.cookies), urllib2.HTTPSHandler(debuglevel=1))
in api.py

Hope this helps.

[cariaso]

To save someone else the time, this change worked for me with the current version of the code

           if wiki.passman is not None:
                    self.opener = urllib2.build_opener(urllib2.HTTPDigestAuthHandler(wiki.passman), urllib2.HTTPCookieProcessor(wiki.cookies))
            else:
                    self.opener = urllib2.build_opener(urllib2.HTTPHandler(debuglevel=1),urllib2.HTTPCookieProcessor(wiki.cookies))