#15: removes Infobox (little BUG: adds a blank word as first token)
#15 fixed the 'first token is empty term if there was an Infobox' bug
#15: refactored and removed unnecessary splitting into tokens before lemmatization -> increases performance.
#16: removes bold and italic marks but preserves single apostrophes like in I'm or we're
#15: implemented picture removal. Preserves the picture description as desired.
#15: implemeneted reference removal
#15: some pictures have given width in pixels, some don't - now both is handled, still preserving the picture description as desired
#15: failed attempt to handle web citation correctly (worth describing)
(removing keywords like 'cite', 'web', 'title', 'author', removing the url, removing dates completely, but keeping the values of title, author etc.)
#15 now handles pictures with left|center|right alignment correctly (removing all these keywords while keeping the description)
CLoses #16.
Keeps #15 open because we don't hanle sound links explicitly.
However most of the sound links should be handled by more general patterns already implemented (all brackets, attribute names, and URLs will be removed anyway)