23 integrate osm route mapping

[gmatosferreira]

• Implemented method osm_shapes_match_routes to find OSM routes matching GTFS shapes geometry;
• Implemented methods osm_shapes_to_routes and osm_trips_to_routes to get OSM geometry given a match with GTFS feed shapes/trips ids;
• Updated osm and analysis vignettes, to document the new changes with examples;
• Created script to update bus routes at OSM database with shape_id, stored at inst/python/osm_routes_add_shapes.py;
• Validated manually (script at dev folder) for Rennes, FR.

[temospena]

Let's do it, nice job!

I wonder why you removed the () from the functions at the vignettes, but we can discuss that later.