Fix the Memory leaks in Nepomuk Core -
* ResourceData::updateKickOffLists shouldn't be given a Soprano::Node::uri() as the node might not have a uri ( in the case of a Resource ) It's better to pass it a Nepomuk::Variant and let it get the type from there.
* ResourceManager::cleanUpCache() should also clear the m_initializedData. This is required in the rare case when all the kickOffProperties are removed.