Initialise Google Maps, Set Location, Drop Pins, Etc...

1. Adding Google Directions
2. Listening to the changes of directions event.
3. Supporting multiple waypoints / dropoffs on the map (Max is 8).
4. Centering map to the current location using Geolocation feature.
5. Dropping the marker into the map on click event.
6. Attaching the callback for marker's click event while dropping the marker into the map / textfield input filled (AutoComplete).
7. Deleting the marker from the map with deletingMarker.
8. Reset direction's route.
9. Drawing polyline.
10. Getting the marker object.