title: Rolify tables are not getting created
body: <p>After bundle installing the gem(gem 'rolify'), I have generated the file using the following command,</p>
  
  <pre><code>rails g rolify Role User
  </code></pre>
  
  <p>Below files got created,</p>
  
  <pre><code>invoke  active_record
  create    app/models/role.rb
  invoke    rspec
  create      spec/models/role_spec.rb
  invoke      factory_girl
  create        spec/factories/roles.rb
  insert    app/models/role.rb
  create    db/migrate/20140425070708_rolify_create_roles
  insert  app/models/user.rb
  create  config/initializers/rolify.rb
  </code></pre>
  
  <p>Then, i gave</p>
  
  <pre><code>rake db:migrate
  </code></pre>
  
  <p>Its giving me the warning, </p>
  
  <pre><code>[WARN] table 'Role' doesn't exist. Did you run the migration ? Ignoring rolify config.
  </code></pre>
  
  <p>Also tables are not getting created. What is the problem am i missing anything here.?
  This my migration file,</p>
  
  <pre><code> class RolifyCreateRoles &lt; ActiveRecord::Migration
      def change
       create_table(:roles) do |t|
        t.string :name
        t.references :resource, :polymorphic =&gt; true
        t.timestamps
       end
  
      create_table(:users_roles, :id =&gt; false) do |t|
        t.references :user
        t.references :role
      end
  
      add_index(:roles, :name)
      add_index(:roles, [ :name, :resource_type, :resource_id ])
      add_index(:users_roles, [ :user_id, :role_id ])
    end
   end
  </code></pre>
  
  <p>My versions,</p>
  
  <p>Rails - 4.1.0
     Ruby - 2.1.1</p>
  
  <p>Please any one help me in this..</p>
  
  <p>Thanks in advance.</p>