[TASK] bump ripple-lib to 0.9.4-rc1
[TASK] shrinkwrap dependencies
[FEATURE] Balances|Trustlines: Return ledger index (RLJS-127)
[FEATURE] Balances|Trustlines: Use last validated ledger by default
[FEATURE] Balances|Trustlines: Return ledger validated in response

Returns validated (boolean) if the ledger_index returned is validated or
not