DNN-5455 Extension method for binding PetaPoco dynamic result set 

PetaPoco is mostly used together with strong typed Info-classes. Thats nice and working well but sometimes we need a more flexible way to retrieve data. Think of a simple module where the user enters an arbitrary select statement to any table of the database (yes, I wont do that! Its just for explanation!). With PetaPoco this could be done with ExecuteQuery<dynamic> and the result is of type IEnumerable<dynamic>. This is nice and working "out of the box". But you can not databind this IEnumerable<dynamic> to a datagrid : even if the data is retrieved correctly, nothing is shown in the grid. So I implemented an extension method for IEnumerable<dynamic> named "ToDataTable"