Suggest route: UI Events

- TODO: prompt user for the origin(text) and destination(text) before they
  can trace the route
- TODO: Save routes to the DB
- Clicking suggest route would show 3 buttons: Done, Clear and Cancel
- Clear would reset the markers, so that users can create again the route
- Cancel would return them to normal mode
- All of the buttons will trigger a function that will remove the click
  event on the map