Search - add "live" search results

- now it is possible to have Search results directly when
you are typing (and not only when you press on the Search button
in the IME)
- implement onQueryTextChange(...)
- take care about re-runnin the saved query when the app is resumed

Change-Id: I021c8a9a95b50dce69ab6dace81eecb2fb188f18