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
autocomplete : object added for api pt_object
Merge pull request #587 from kadhikari/add_api_ptobjects

Add api pt_objects