added filetype extractor in urls.py, more modular, fixed bug where our image processor would error out on .ico images (very small images), added more clear ubuntu install instructions
Fixed long-form article issue w/ calculate_best_node

See https://github.com/jiminoc/goose/blob/master/src/main/scala/com/gravity/goose/extractors/ContentExtractor.scala#L227
Merge pull request #49 from jeffnappi/patch-1

Fixed long-form article issue w/ calculate_best_node