* VRFS-259: beta signup

up/collapse_user_and_admin.sql

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+-- make your life easy and use this name for your encrypted password 
+ALTER TABLE users RENAME COLUMN password_digest TO encrypted_password;
+
+DROP TABLE admin_users;

up/default_gender_to_null.sql

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+ALTER TABLE users ALTER gender DROP DEFAULT;

up/invited_users.sql

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+-- a table to manage invitations from one user to another
+CREATE TABLE invited_users (
+    id VARCHAR(64) PRIMARY KEY DEFAULT uuid_generate_v4(),
+    sender_id VARCHAR(64) REFERENCES users(id) ON DELETE CASCADE,
+    autofriend BOOLEAN NOT NULL,
+    email VARCHAR(256) NOT NULL,
+    invitation_code VARCHAR(256) UNIQUE NOT NULL,
+    accepted BOOLEAN DEFAULT FALSE,
+    note text,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP 
+);

up/subscribe_email.sql

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+ALTER TABLE users ADD COLUMN subscribe_email BOOLEAN DEFAULT false;