bitly_http dropping timeout for non-PyCurl users

[adamn]

def makeUrllib2Http(url, user_agent):

should be:

def makeUrllib2Http(url, timeout, user_agent):

And use the timeout in urllib2. This requires Python 2.6 so you could wrap this in a try: except: for more portability. However, Python 2.6 has been stable for 2 years now.