title: separate entity framework 6 entities into separate class library
body: <p>i have followed the steps in this question 
  <a href="https://stackoverflow.com/questions/20317913/separate-poco-object-classes-and-dbcontext-from-entity-framework-6-model">Separate POCO Object classes and DBContext from Entity Framework 6 Model</a></p>
  
  <p>and i'm done with that, and every thing works good. but my problem is each time i made some changes on the model (edmx) file, the changes do not affect the .tt file, so i go and just save the .tt file to update the mapped classes .</p>
  
  <p>any help please.</p>