4.3.0 (2019-04-01)

editor: only delete stop_times/freq when deleting a pattern (90d5c3e), closes #203
load: handle bad refs found in calendar dates (3be3d21), closes #202
loader: refactor field loader to clean value and return errors (2f0cb34), closes #191
normalize stop times: add test for and normalize stop times (4b7c74f)
snapshot: create feed registry if not exists when snapshotting (1a91296), closes conveyal/datatools-server#154
Table: refactor table; add comments (6774ccd)
validate: fix rounded travel times check (fb45651)
validate: re-enable overlapping trips check (263ee5a), closes #207

editor: normalize stop times travel times for set of pattern stops (faeaf1f)
GraphQL: allow nested queries where fields don't match (98194d0), closes conveyal/datatools-ui#428

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