Statistician
- Returns some times in milliseconds instead of microseconds

KadServer
- Made a few operations synchronized
- Handled the exception when the timer is already canceled
KademliaNode.Get method updates
- Since we have cached content, if the get request is for a content we have a cached version of, we just do a getUpdatedContent RPC to check if there is an updated version instead of getting a new content which may be the same version we already have