Added anaphora resolution rules and testing data

Added two rules:
1. pronoun-finder
2. anaphora-resolution
as well as testing data and a README file.
Hmm. You seem to be creating a linked list of all the words in a sentence. We talked about this, and I thought we decided that this was a bad idea, as the linked lists are too hard to traverse. Right?  The email talked about having a WordSequenceLink, and I added this last month.   Relex does not yet generate it, I will change that now.

The output will then be:
```
  WordSequenceLink
      WordInstanceNode "blah"
      NumberNode  42