Apache Forrest code fix

code fix
by
JT
:

Now all files in src/documentation/content (except xdocs)
and src/documentation/resources/images are copied across
when Forrest generates a static site. This fixes the problem when an
unparseable file links to another, and Cocoon can't crawl (and hence
copy) the linked-to file. An example of this are CSS
url('foo.png') image refs (so krysalis-site will now work
properly). Also, large batches of pregenerated files like Javadocs will
now be copied across instead of individually traversed.