pause immunization documentation to refactor master.
I hate HL7.  Mid immunizations commit.
draft of immunizations created.
Merge branch 'master' into matt-immunizations
first version of the encounters
Update documents for encounters
Added identifiers and  changed from code to value
allergies and encounters are added to ccd
- code_system->code_system_name
- remove all uris
Correct allergies codeSystem to code_system_name
Updated the document for code_syetm->code_system_name
incremental commit for main-merge.
Merge branch 'master' into matt-immunizations

Conflicts:
	docs/model.md
reconcile merge conflict in documentation.
Immunizations done, untested.
All patient id stuff is removed
Remove unnecessary cleanup step
remove ret.src; not needed
remove ret.codes; not used
_id field does not exists anymore; remove from tests