back to functionnalites of very first app

Notes:
Finally, I'm back to the functionnalites of the very first app version,
although translations and contents are coming from a local storage,
which updates from server manually and automatically.

IMPORTANT:  due to a bug (on $state.reload not re-instantiating
controller) currently still open
(https://github.com/angular-ui/ui-router/issues/582), I have to put the
"settings" screen on its own route, and I have to bring the user back to
the home page after each update, in order for the "home" state to
trigger the controller, and hence the view to redraw with the new data
to display.

TODO:
-clicking on rss entry must navigate to "detail" page
-code the transport and useful numbers page to ensure
-data "resolve" for all routes
-must cache images referenced in the JSON data (or not, because then
I'll have to implement some sort of background task to clean unused
images over time)