- Added new extractors:
- pinterest
- rule34
- dynastyscans
- imagebam, coreimg, imgcandy, imgtrex
- Added login capabilities for batoto
- Added `--version` cmdline argument to print the current program version and exit
- Added `--list-extractors` cmdline argument to print names of all extractor classes together with descriptions and example URLs
- Added proper error messages if an image/user does not exist
- Added unittests for every extractor