Create flickr_random_downloadr.py

usage: flickr_random_downloadr.py [-h] [-u USERNAME] [-n NUMBER]
                                  [-s {s,q,t,m,n,z,c,b,o}] [-t] [-nc]

Download a Flickr set

optional arguments:
  -h, --help            show this help message and exit
  -u USERNAME, --username USERNAME
                        The username to download from. (default: example)
  -n NUMBER, --number NUMBER
                        Number of photos to download (default: 10)
  -s {s,q,t,m,n,z,c,b,o}, --size {s,q,t,m,n,z,c,b,o}
                        The size of photo you want to download. Size must fit
                        the following: s - 75x75, q - 150x150, t - 100 on the
                        longest side, m - 240 on the longest side, n - 320 on
                        the longest side, z - 640 on the longest side, c - 800
                        on the longest side, b - 1024 on the longest side
                        (default), o - original (default: b)
  -t, --title           Use the title as the filename (TODO ensure title is
                        filesystem-safe) (default: False)
  -nc, --noclobber      Don't clobber pre-exisiting files (default: False)