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.



Those are testing cases generated manually, unit test still to be created.