title: What is the difference between Redmine versions 3.x and 2.x
body: <p>I have done quite a bit of looking on the Redmine website, and executed a number of Google searches, but I have not been able to find an answer to the difference between Redmine 2.x and Redmine 3.x</p>
  
  <p>I imagine that, much like Redmine 1 vs Redmine 2, it has to do with the version of Rails that the platform is built on, but I would be interested to know a little more in-depth about the differences and compatibility.</p>
  
  <p>I imagine, also, that plugins are not compatible between the two versions, so this leaves one to wonder, what are the benefits of using one over the other?</p>
  
  <p>Edit: I do see the Rails version difference listed on the <a href="http://www.redmine.org/projects/redmine/wiki/RedmineInstall" rel="nofollow">Installation page</a>.  What is the difference beyond that?</p>