working on in-memory/leveldb hybrid caching
added ability to load previous leveldb values back into dblimiter lru tracker
fix nil ptr deref and make cloudlus cmd work with new changes
caller gets to pass in DB for cloudlus server, defaut if nil. cache and db size flags to cloudlus cmd
server can now repopulate queue from disk db
cleaner logging. fixed a bug when reloading queue
added persistent disk store with ability to reload queued jobs and other nifty things