Tristan Cacqueray 4d473dc0bd Refactor timeline structure
This change modifies the timeline structure to describe a
start and end date instead of two different events.

Moreover this change adds:
* the number of days remaining until the next event.
* a 'next' status when current event haven't started yet

Change-Id: Ib76b0315a7409a8442c1be6f8341b0596c1d56ae
2016-11-09 03:18:01 +00:00
..
2016-11-09 03:18:01 +00:00