Disabled "smart" query limit setting and also disabled using SimpleQuery in case property prefetching is enabled.
Removed left over imports
Use simple hashmap for caching in CacheVertex and made sure all access to it is synchronized. This a single vertex in a single transaction it not contended a lot, this should be a lot more space and memory efficient than a heavy Guava cache. In the future, we should investigate how to release memory heuristically on such this "cache".
Implemented a database level storage cache for Titan that significantly increases warm cache performance.
Added tests for the cache.