ViewModels are being reloaded on config changes

"Branch : todo-mvvm-live"

. when i rotate device , viewmodel.start has call again and reload data from repo ,the method replaceData is call twice because it load fist time from cache list in viewmodel and second time from list in repo, so the viewmodel architecture are not applied at this time , please fix this , tkanks

Start from the todo-mvvm-live branch and reproduce the reload during device rotation. Trace ViewModel.start and the two replaceData calls, comparing the cache list with the repository list. Done means configuration changes no longer cause the ViewModel to reload or replace the data twice.

Written by the indexing model from the issue text.