[WIP] Station hierarchy

[irees]

Resolves #292

PR include models for stopStation, stopPlatform, stopEgress. The map viewer is in the stop-map component, which draws the leaflet layers & defines actions for interacting. The main change to the existing stops route is to use stop_stations as the model and use the stop-map component in the template.

Icons defined in components/stop-map/component.js

var stopStationIcon = L.icon({
   iconUrl: 'assets/images/search-active.png',
   iconSize: [36, 54],
   iconAnchor: [18, 54],
   popupAnchor: [0, -54]
 });

[irees]

bbox for testing: http://localhost:4200/#/stops?bbox=-122.39740490913391%2C37.78669932495591%2C-122.38633275032042%2C37.792659800376455

[irees]

Icons defined in components/stop-map/component.js

var stopStationIcon = L.icon({
   iconUrl: 'assets/images/search-active.png',
   iconSize: [36, 54],
   iconAnchor: [18, 54],
   popupAnchor: [0, -54]
 });