Merge remote-tracking branch 'origin/feature/28' into feature/28

resources/migrations/20180408124500-reference-data.down.sql

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+alter table issues drop column current;

resources/migrations/20180408124500-reference-data.up.sql

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+alter table issues add column current boolean default true;
+

resources/migrations/20180526162051-dwellings.down.sql

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+alter table electors
+  add column address_id references addresses on delete no action;
+
+update electors
+  set address_id =
+    (select address_id
+       from dwellings
+       where dwellings.id electors.dwelling_id);

resources/migrations/20180526162051-dwellings.up.sql

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+CREATE TABLE  dwellings
+(
+  id INT NOT NULL PRIMARY KEY,
+  address_id INT NOT NULL references addresses on delete no action,
+  sub_address VARCHAR( 32)
+);
+
+alter table electors
+  add column dwelling_id int references dwellings on delete no action;
+
+alter table electors drop column address_id;