title: Migrations in Rails Engine?
body: <p>I have multiple rails applications talking to the same backend and I'd like them to share some migrations.<br>
  I setup a rails engine (with enginex), I can share anything (controllers, views, models,...) but no migrations. I can't make it work !</p>
  
  <p>I tried to create a file db/migrate/my_migration.rb but in my main application if I do :</p>
  
  <pre><code>  rake db:migrate
  </code></pre>
  
  <p>It doesn't load them. </p>
  
  <p>After some googling it appears there was some <a href="https://rails.lighthouseapp.com/projects/8994/tickets/2058-rake-tasks-for-run-engine-migrations" rel="noreferrer">recent work</a> on this and it seems <a href="https://github.com/drogus/rails/compare/a5c8d892...5ba45959" rel="noreferrer">this</a> has been merge to rails master.
  I'm with rails 3.0.3 do you see any way to make this work ?</p>
  
  <p>Thanks !</p>