Process : add quick constructors for AddMetadata process.
Library : add converter between String and DataReference/StyleReference objects and improve DataReference equals/hashCode and toString.
Admin : add support of StyleReference as process inputs
CSW : add RemoveMetadata from CSW process.
Configuration : add getLayer to LayerBusiness to get a single layer.
Map-service : new process RemoveLayerFromMapService added.
Storage : add quick constructor for DeleteProvider process.
Prevent potential NPE on injected beans for process junit tests.
Provider : add some useful methods on CoverageGroupProvider to manipulate provider map context.
Process : update AddDataToMapContext process and add a RemoveDataFromMapContext process.
Update spring to 4.0.6.RELEASE