added 3 sections connector recalculation when dragging shape
added connection recreation (find shortest way between two shapes) when dragging shape with 'ctrl' pressed
Merge branch 'develop' of https://github.com/robertwaszkowski/gwt-connectors into develop

Conflicts:
	gwt-connectors/src/main/java/pl/tecna/gwt/connectors/client/drag/ShapePickupDragController.java
	gwt-connectors/src/main/java/pl/tecna/gwt/connectors/client/elements/EndPoint.java