Load i.redd.it image urls

[Elucidation]

Currently the bot is not able to load the images from i.redd.it links because of HTML Error 403: Forbidden, which is due to Reddit blocking bot bulk image retrieval.

def loadImageFromURL(img_url):
  """Load PIL image from URL, keep as color"""
   return PIL.Image.open(StringIO(urllib.urlopen(img_url).read()))

We can get around this using urllib2 Requests with a user agent in the header, as described on http://stackoverflow.com/questions/3336549/pythons-urllib2-why-do-i-get-error-403-when-i-urlopen-a-wikipedia-page