Issue #70 - The issue was using shared_ptr for handling owner in PooledDataSession. After destruction of data session instance, owner (datastorage factory) was deleted automatically.
Changed DataStorageFactory of MasterServer to pooled one.
Added new config entry for defining the database connections pool size and added appropiate implementation for handling this.
Merge branch 'ConcurrentServer-prototype-1' of https://github.com/jam231/sia2013 into ConcurrentServer-prototype-1