merge
Merge branch 'master' of https://github.com/genericsystem/genericsystem2014.git
Bug fix in Transaction : if the Generic is not alive, getInheritings
getInstances and getMetaComposites return null;

Bug fix in CacheTest : test001_getMetaComposites
we call getMetaComposites() instead of
impl.Generic.getMetaComposites(powerVehicle)