Mono fixes for main project.

DynamORM.Tests/DynamORM.Tests.Mono.csproj

@@ -37,7 +37,7 @@
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
-    <Reference Include="nunit.framework, Version=2.5.10.0, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77">
+    <Reference Include="nunit.framework">
       <Private>False</Private>
       <Package>nunit</Package>
     </Reference>

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;
                     }
             }
         }