Feature/editable grid

Can be used as
 Configurations configs = currentPage.adaptTo(Configurations.class);
       <%=configs.lookup("col1","test").get("col2")%>

1. When we create a config page under some folder which has "/config" in its path, we will see a multifield to add columns in createpage dialog.
2. We will be able to add duplicates as well (I have hidden uid(random generated) for each record)
3. This will be the node name.(not nice but allows us to have lists). Impl can be tweaked to have user inputted uid field.
4. lookup basically will search in the childpage and then search in the parent page and so on.
5. Please validate the approach.