title: Knex migration does not create tables
body: <p>I've got some Knex migration scripts that look like this: </p>
  
  <pre><code>'use strict';
  exports.up = function (knex) {
      return knex.schema
          .hasTable('user')
          .then(function (exists) {
              if (!exists) {
                  knex
                      .schema
                      .createTable('user', function (table) {
                          table.increments('id').primary();
                          table.string('firstName');
                          table.string('lastName');
                          table.string('email');
                          table.string('password');
                          table.string('username');
                      })
                      .then(console.log('created user table'));
              }
          });
  };
  </code></pre>
  
  <p>The first time I ran this script, it created a table, which was great, but then I noticed that the table was malformed (I had passed a wrong parameter.) So I manually deleted the created table from my database, along with the knex_migrations and knex_migrations_lock tables, and re-ran the migration command. Now, it tells me that all migrations have run, but I still don't see the table. What gives? Is there a piece of of config hiding somewhere that I need to delete?</p>