Reworked Image.new to contain a url and x,y values. Added Image#url, Image#x and Image#y.
Added Submission#author? to check if a certain user is the author of this submission.
Made preview, screen and full size recognition in Page.new optional. Not all instances have all values.
Added the main page to each submission. Main page has index zero and real pages start at index one.
Added API#watchlist.