title: Rails Seedbank gem uninitialized constant
body: <p>I am using seedbank gem and getting uninitialized constant on the first line of my seed file
  User.create(...)</p>
  
  <p>I can run rake db:seed fine without seedbank.</p>
  
  <p>I am using mongoid.</p>
  
  <p>With seedbank I get.</p>
  
  <p>Error is:</p>
  
  <pre><code>rake aborted!
  uninitialized constant User
  /home/user/my_project/db/seeds.rb:4:in `block in define_seed_task'
  /home/user/.rvm/gems/ruby-2.0.0-p247@myi/gems/seedbank-0.3.0/lib/seedbank/dsl.rb:24:in `module_eval'
  /home/user/.rvm/gems/ruby-2.0.0-p247@myi/gems/seedbank-0.3.0/lib/seedbank/dsl.rb:24:in `block in define_seed_task'
  /home/user/.rvm/gems/ruby-2.0.0-p247@myi/bin/ruby_executable_hooks:15:in `eval'
  /home/user/.rvm/gems/ruby-2.0.0-p247@myi/bin/ruby_executable_hooks:15:in `&lt;main&gt;'
  Tasks: TOP =&gt; db:seed =&gt; db:seed:common =&gt; db:seed:original
  </code></pre>