added filtering, added more than just imgur.com

direct jpg links will also be added to available images
some subreddits automatically ignored such as foodporn and comicbookporn
as i deem them too boring/raunchy/not-what-i-want-to-see for whatever reason

added subreddits.txt link to user/kjoneslol/m/sfwpornnetwork
an excellent user who collates all the sfwporn network subreddits together.
added explicit subreddits too