Return a list of duplicates instead of just the highest match

[mdavidsonST]

I forked the repository and made quite a few changes around being able to return a list of duplicates. I'm not a salesforce apex expert, but I tried to make the changes flow through the whole action appropriately. I can do a pull request if others would like, but my last pull request hasn't been touched so I figured it was better to create an issue in case anyone is looking for this I can make it available.