Add parsing of URIs and text to DOI class
Extract DOI from original_citation text
Added ISBN URI type
Simplify URI registry
Improvements to URI registry including priority and filtering
Refactor Doi From Reference resolver to extract References of any URI type
Add some shared specs to ensure that all types implement the same interface
Added some comments
Rename NLM to JATS
Add test for ISBN 10 normalization
Change prefix for isbn's to urn:isbn:....
Improve URIs to initialize with URIs as well as raw identifiers
Split metadata out of the URI object so that we can reuse them elsewhere (for example URI normalization in the API) without the extra payload.
Refactored URL from Reference resolver
Removed the last of the metadata code from the Uri classes
Merge pull request #10 from ploslabs/feature/resolve_citations

Since neither of us is on this project anymore I'm going to take the liberty of merging this into master