MarkerClustererPlus: Tagging 2.1.2 release.

MarkerWithLabel: Tagging 1.1.10 release.

InfoBox: Tagging 1.1.13 release.

MarkerClusterer Release 1.0.2

KeyDragZoom: Tagging 2.0.9 release.

Tag new version of markermanager as 1.2.

Adding released version of extdraggableobject. Hopefully I'm doing th…

…is right

Fix a typo in the RouteBoxer docs.