updates for hobbs algorithm

@linas 

It can do basic pronoun resolutions correctly right now.
AND conjunctions are now supported, other conjunctions are not supported.

Just started working on https://groups.google.com/forum/#!topic/opencog/gzA3uL26AwM

Some testing results which are marked as "Failed" should be marked as "Passed", I only have corrected some of them.  All the testing results will be updated in the next pull request.



> In opencog/nlp/anaphora/rules/filters/filter-#16.scm:
>
> > @@ -0,0 +1,84 @@
> > +;; anaphor is non-reflexive
> > +;; The parse tree structure is:
> > +
> > +;;          verb
> > +;;         /    \
> > +;; antecedent    noun
> > +;;                 \ "of"
> > +;;                 anaphor
>
> "John saw a picture of him."
>

OK, well just add that to the file. Something like this:

For example, in the sentence "John saw a picture of him.", "John" should
not be linked to "him."