public Map<String, Instance> extractLinks(LinkNeighborhood[] linkNeighboors, String[] features)
            throws MalformedURLException {
        Map<String, WordField[]> linkFields = extractLinks(linkNeighboors);
        return mapFeatures(linkFields, features);
    }
Extract the information from links as word in the URL, anchor and around links, and converts
it to an Instance object

@param linkNeighboors The LinkNeighborhood instances to be converted to Instance
@param features String[] pre-defined words
@return HashMap mapping url -> instance
ache/src/main/java/achecrawler/link/classifier/builder/LinkNeighborhoodWrapper.java