reformated _value_added_process
added a reminder to separate finding big_images from transcoding and, autopep8ed
changed one line todo to match the todo convention
added - must support feed_link
added - must support feed_id in rss.py as well
put transcode into a try-except to remind transocder to raise an exception when fucked up.
prepared to write try-except in transcode
added a reminder in todo to add customized Exception class
added a demo raise-exception for web-path
updated rss
removed find-big-images method from transcoder
created image_scraper from code segment in transcoder
rewrote find_images
rewrote image_scraper
simplified big_images finder in rss_parser based on image_scraper
wrote a line to dedup big_images
added find_images support for local file
added finding big images segment in rss.py
added method find_biggest_image
updated image_scraper in rss to image_helper