move sample user creation in seeds

app/models/user.rb

@@ -50,6 +50,7 @@ class User < ActiveRecord::Base
 
   def setup_role
     self.is_admin = true if User.count == 0
+    roles << Role.where(name: 'Admin') if User.count == 1
   end
 
   # Gets the roles of the user, groups them by role.name and returns the resource(s) of each role