added httperror catching in image_helper.py
added httperror catching in thumbnail.py
added httperror catching in baidu_uck_new.py
added httperror catching in baidu_uck.py
added httperror catching in transcoder.py
corrected a typo: modfied --> modified
added line to change feed_title to the latest from rss info
autopep8ed rss_parser.py