refactored cat1 roundtrip test, added relevant fixtures, removed extraneous fixtures, fixed affected tests
Merge branch 'cat1-roundtrip'

Rebasing and merging pull request #102
adding mongoid-tree as dependency; provider tree
Merge pull request #104 from projectcypress/mongoid-tree

adding mongoid-tree as dependency; provider tree
workaround: add code, code_system, and codeSystemName to ordinality
workaround: new xpath for negation reason, and add code_system to negation reason
workaround: encounter reason
workaround for anatomical structure code
workaround for ordinality code
workaround: encounter order should just have a time, but one of the measures requires start_time
Revert "workaround: encounter reason"

This reverts commit 5ebc869c3477ca66bdecb34f777e4d764f6fdfd7.
move reason xpath override and admit_time to Cat1::EncounterPerformedImporter

Conflicts:
	test/unit/import/cat1/patient_importer_test.rb
workaround: codes in encounter reason
rebased yoons pull request, fixed test suite and errors
Merge branch 'measure-calculation-workarounds'

Rebasing and merging pull request #103
Updating the README
verifying risk category assessment value import, modified unit test to assert value import
Merge branch 'risk_category_assessment_value'

Rebasing and merging pull request #105
Fix patient ids when importing by_patient results
Merge pull request #106 from sporkd/fix_import_patient_ids

Fix patient ids when importing by_patient results