Cache georesource info and lazy load correct

Implement the IGeoResouces so that they cache the information from the last loading locally and until resolve is called for a feature source or a datastore (or their "real" object) then use the cached information. When the "real" object is loaded then update the cached information with the real information. This should work the vast majority of the time since Services change fairly slowly. It will definately speed up browsing through the catalog and doing searches on the local catalog.