All: rewrite helps
Disruptions: add new object model

add chaos object model to navitia.

Still keeping the old one before approval of this model.
Diruptions: add pool to causes and severities
Disruption: tags are also pooled

and no date period, only time period
Merge pull request #594 from antoine-de/preparation_for_chaos

Disruptions: add new object model
Merge pull request #588 from l-vincent-l/rewrite_help

All: rewrite helps
navitia : new api pt_objects added

objects network, mode, line, route added
dinctionary autocomplete used
navitia : pt_objects sorted

tests added.
lines commented deleted.
navitia : stop_area added in api pt_objects

Test added
autocomplete : dictionary modified

Networkname, modename and linecode added in line
and route name.
autocomplete : comments modified
navitia : comments modified
protobuf : elements added in places
autocomplete : protobuf pt_object used for places
autocomplete : function autocoplete used for api pt_objects

Tests modified
autocomplete : corrections on comments
autocomplete : some modifications for comments
autocomplete : deletesubrange replaced by removelast