Added Code struct. Refactored code to use it.
Updated readme to note unstable API
Fixed bug with parsing time. Now returns Zero time structs if no time was found.
Fixed bug in medtable where it would crash if HTML wasn't correct.
Added links documentation.
Minor changes.
Renamed ascx12 to edix12. ASC X12 is an organization that develops standards.
Added util. Added NormalizeNDC and test.