Add URLs for all code systems about bluebutton.js

[marks]

Integration with NLM/NIH/HHS's UMLS makes a lot of sense. Might need to require users to bring their own license.

• https://uts.nlm.nih.gov/home.html
• https://uts.nlm.nih.gov//home.html#apidocumentation

[mjacksonw]

For my money, anything that requires users to bring their own license (even though it's free, it's very annoying) is friction we should hold off on until a later version, or hide behind an appropriate flag like bb = BlueButton({ xml: 'blah.xml', umls: true }) or something.

[jmandel]

For the ontologies available (including RxNorm, SNOMED CT, and LOINC), SMART uses URIs at bioontology.org:

Examples:
http://purl.bioontology.org/ontology/SNOMEDCT/8957000
http://purl.bioontology.org/ontology/RXNORM/70618
http://purl.bioontology.org/ontology/LNC/2823-3

Would highly recommend this as a way to make code system / codes more discoverable for developers.

[marks]

As a developer working to wrap his head around all these ontologies, @jmandel's suggestion gets +∞

[blacktm]

These coding system URLs should be added to lib/codes.js, and we'll expose them in the JSON in the near future.