Modified VehiclesActivityDiagram.uml s.t. it only contains one flow (ObjectFlow)

Modified VehiclesActivityDiagram.uml s.t. it only contains one flow
(ObjectFlow) from CreateObjectAction OutputPin to CallOperationAction
InputPin
Replaced Object_Builder with Object_Transformer

Object_Transfomer works the other way around: it takes the fUML
Placeholder Object_ FeatureValues and looks them up in the
corresponding Java Object. Supported types: IntegerValue, BooleanValue,
StringValue. No support for Object_ in Object_ and inherited fields yet.
Organized imports.
Incorporated suggestions from March 26, 2013

Includes modifications on the methods:
obtainFUmlObjectFromCallOperationActionInputPinActivation(..);
assignObject_ToCreateObjectActionOutputPin(..);
assignObject_ToCallOperationActionInputPin(..) --> now:
assignTargetInputPinToCallOperationAction(..); replaceLocusObject (now
it changes the already existing Object_)