User creation

migrations/2018-04-22-151330_create_user/down.sql

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+-- This file should undo anything in `up.sql`
+DROP TABLE users;

migrations/2018-04-22-151330_create_user/up.sql

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+-- Your SQL goes here
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR NOT NULL,
+    display_name VARCHAR NOT NULL DEFAULT '',
+    outbox_url VARCHAR NOT NULL,
+    inbox_url VARCHAR NOT NULL,
+    is_admin BOOLEAN NOT NULL DEFAULT 'f',
+    summary TEXT NOT NULL DEFAULT '',
+    email TEXT,
+    hashed_password TEXT,
+    instance_id INTEGER REFERENCES instances(id) ON DELETE CASCADE NOT NULL
+);