Source of errors: spec

[frapontillo]

Let's discuss a little bit all the foreseeable source of errors we currently have/handle/don't give a f---.

1. No network: should cause "no network available" (or disregard if a previous value is available, discuss!)

2. Poor network / connection timeouts / network f---up

   a. should retry a few times
   b. then fall back to case 1

3. No location provider

   a. should cause a "no location provider available message"
   b. should check for a location provider every time we request it
   c. should show the previous temp if available and pretend the world is flat? (discuss!)
   d. should we use Play Services only (pros: setup a min distance before triggering an update, cons: less devices, maybe)? (discuss!)
   e. optionally to d., should we migrate to Android-LocationHub (tests needed)? (discuss!)

4. No location available

   a. should be protected by "no location provider available" (see 3)
   b. should use the previous location? (discuss!)