Create users migration

[mmccollum]

CREATE TABLE users
(
id BIGINT
, username VARCHAR(100) NOT NULL
, lastname VARCHAR(256)
, firstname VARCHAR(256) NOT NULL
, date_joined TIMESTAMP
, approved_ind SMALLINT NOT NULL DEFAULT 2
, baduser_ind SMALLINT NOT NULL DEFAULT 2
, delete_ind SMALLINT NOT NULL DEFAULT 2
, contact_info JSONB
, PRIMARY KEY (id)
);