Started Immunizations.
Factored out _patient from problems parser.
refactor partially working, in need of overhaul.
removed identifier type requirement.
Update problems.md
incremental cleanup commit.
Finished tests, except negation indicator.
Functional Problem List.
Merge branch 'matt-afsin-refactor'
Merge branch 'documentation'
Fixed so broken tests run.
Merge branch 'master' into afsin

Conflicts:
	lib/parser/ccda/oids.js
	
Corrected