changed way of reading network stream, added support for client cache at ODatabase level (also added to synchronous command)
fixed request command to always read the prefetched records count in sync mode
REQUEST_DB_EXISTS and REQUEST_DB_DROP require storage type since 1.5 snapshot, reconnect connection when there is an exception while parsing response (since the socket becomes unstable)
Fix
Merge pull request #37 from sowee15/master

Reading network stream, client cache, prefetched in synchronous command