Added: Geoclicker option and mapObject event.

1. enabling/disabling is done dependent on the corresponding option
(enableGeoclicker: true/false).
2. An event "MapObjectInitialized" (with map-object as its argument)
added to "_initMapObject", so the code that uses plug-in will be able to
use the 2GIS JS API through 2GIS map-object.
Merge pull request #2 from SeregaMatin/master

Added: Geoclicker option and mapObject event.