Update Javascript/src/knockout.bindings.dataTables.js

Since Datatables.js 1.9 the property "mDataProp" can be a function (see http://datatables.net/docs/DataTables/1.9.2/DataTable.defaults.columns.html#mDataProp). If a function is registered here, we need to execute it in order to get the values.
Merge branch 'master' of github.com:bertl/Knockout.Extensions

Conflicts:
	Javascript/src/knockout.bindings.dataTables.js