fix for issue #7 in editors (linking resource cannot connect containers)

edu.kit.ipd.descartes.mm.resourcelandscape.edit/.gitignore

...ipd.descartes.mm.resourcelandscape.edit/plugin.properties

...rrepository/provider/ContainerRepositoryItemProvider.java

...nerrepository/provider/ContainerTemplateItemProvider.java

...ovider/ContainerrepositoryItemProviderAdapterFactory.java

...ion/provider/ActiveResourceSpecificationItemProvider.java

...tion/provider/ConfigurationSpecificationItemProvider.java

...rovider/CustomConfigurationSpecificationItemProvider.java

...rovider/CustomResourceConfigurationModelItemProvider.java

...on/provider/LinkingResourceSpecificationItemProvider.java

...provider/NumberOfParallelProcessingUnitsItemProvider.java

...uration/provider/PassiveResourceCapacityItemProvider.java

...on/provider/PassiveResourceSpecificationItemProvider.java

...provider/ProcessingResourceSpecificationItemProvider.java

...ider/ResourceconfigurationItemProviderAdapterFactory.java

...provider/CompositeHardwareInfrastructureItemProvider.java

...ndscape/provider/ComputingInfrastructureItemProvider.java

.../mm/resourcelandscape/provider/ContainerItemProvider.java

...mm/resourcelandscape/provider/DataCenterItemProvider.java

...landscape/provider/DistributedDataCenterItemProvider.java