Merge branch 'release/1.0.23' into develop
ignore egg files
#187 - empty list
#188 - mv article extractor to extractors directory
#188 - create a base extractor class
#188 - contentextractor inherits form baseextractor
#188 - create specific extractors classes
#188 - add tags and author extractors
#188 - correct import
#188 - move video to extractor directory
#188 - move images extractor to extractors dir and correct videos
#188 - rename UpgradedImageIExtractor to ImageExtractor
#188 - ImageExtractor extends from BaseExtractor
#188 - move title extractor from content to title extractor class
#188 - move links extraction to LinksExtractor class
#188 - move tweet extraction to TweetExtractor class
#188 - move authors extraction to AuthorsExtractor class
#188 - renamve authors class file
#188 - move tags extraction to TagsExtractor class
#188 - move opengraph extraction to OpenGraphExtractor class