Mono fixes for main project.

DynamORM/Builders/Implementation/DynamicSelectQueryBuilder.cs

@@ -210,7 +210,7 @@ namespace DynamORM.Builders.Implementation
                                 argex.InnerException.NullOr(a => a, argex));
                         }
 
-                        yield return mapper.Create(val);
+                        yield return mapper.Create(val) as T;
                     }
             }
         }
@@ -1235,4 +1235,4 @@ namespace DynamORM.Builders.Implementation
 
         #endregion Helpers
     }
-}
+}