Added documentation to extractor.
Changed func name contains_producer to contains_producer_with name
and added a new function contains_producer_with_url.

Changed get_information to search for information objects specified
by a given URL instead of a given information title.

Added some new doc comments.
Commenting in globalNetwork is now up to standard. Information is now set to be unique on url instead of name.
Merge branch 'database' of https://github.com/mvk-team42/Veracitor into database
Modified testing to comply with changes in extractor.
Added more comments to producer.
Merge branch 'master' of https://github.com/mvk-team42/Veracitor