Fixed the setting of serverPaging, serverFiltering and serverSorting

the options serverPaging, serverFiltering and serverSorting for the asKendoDataSource() function are evaluating always to true in the current code.
false || true == true
so 
ds.serverPaging = ds.serverPaging || true;

My changes will now evaluate to true for everything else than a value of false, so asKendoDataSource({ serverFiltering: false }) will now work as expected.