api,frontend: add commenter password resets

db/20190606000842-reset-hex.sql

@@ -0,0 +1,8 @@
+-- Create the resetHexes table
+
+ALTER TABLE ownerResetHexes RENAME TO resetHexes;
+
+ALTER TABLE resetHexes RENAME ownerHex TO hex;
+
+ALTER TABLE resetHexes
+  ADD entity TEXT NOT NULL DEFAULT 'owner';