Disease status improvements#5

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dtkirsch wants to merge 8 commits intomasterfrom

disease_status_improvements

Commits on Sep 4, 2018

detect more rationale expressions; normalize both rationale assertions and status assertions; new data schema for output
dtkirsch
committed

Commits on Sep 11, 2018

bug fix
dtkirsch
committed

Commits on Sep 13, 2018

update documentation
dtkirsch
committed

Commits on Sep 17, 2018

Clean up FN integration
schreiaj
committed