Heritrix: Internet Archive Web Crawler

The ExtractorSWF requires excessive amounts of memory
to parse some documents. 100+ MB to parse a ~20 MB file.

Files that are known to cause this:
http://www.umd.umich.edu/casl/natsci/slc/slconline/RECRYS/Recrystallization
.swf
http://www.umd.umich.edu/casl/natsci/slc/slconline/DIST/Distillation.swf

If the crawler is near it's memory limits then it can't
handle this and an exception occurs that can derail the
entire crawl.

Until fixed using this extractor must be considered unsafe.