* The names of the photos downloaded has been changed
* It was previously set to the image count, but has been changed to the actual image id.
* Functions '__get_photo_ids__' and '__check_for_new_photos__' have been added.
* Code now complies with the PEP-8 convention.
* Code now works with Python2.
* The line `!/usr/bin/env python3` has been removed
* Sys module imported to determine python version, and an if statement now imports the urllib, urllib2 and urllib.request modules according to the python version.