Added mapdb to project.
Use mapdb to store mapping of sent tx --> address.
This lets us display coinspark address in transaction details.
Merge branch 'develop-0.9.3' into develop-jsonrpc

We want to use the mapdb of send transactions to addresses.
Fix send to address when not recorded in mapdb - check transaction to see if any assets were sent, and if yes, convert to coinspack address.
listtransaction command now returns the receiving address, whether it is bitcoin or coinspark