renamed FindingsReporter into FindingsForFileReporter

to prepare for checking a FileCollection AND to include file meta info into checking report
updated requirements, included URI reference
included "load test" testManyAnchorTags - tested up to 50.000 anchors

due to a StackOverFlow discussion, jsoup might fail for html files containing more than 4300 anchor-tags
http://stackoverflow.com/questions/18573915/jsoup-finds-only-half-of-9000-a-tags-in-the-document

verified it can find more :-)