Don't include fee reimbursement transactions in the API

[samerbuna]

Instead of returning fee reimbursement transactions as separate records, account for them in their original transaction records

The right place to do this is probably tx-history

[daviroo]

@nicolasburtey do you know if this is this related to the bug we saw in mobile which you asked me to catch up with @vindard to go over?

[vindard]

Related to #1203