Add repeat tx hash

[rstormsf]

if for some reason tx failed, as a user, I should be able to insert a tx hash and repeat it again.

How to do it?

1. Validate tx hash
2. Check status, if it was successful, just offer user to execute it
3. if status was 0x1 which means failed, try to see if

• it was out of gas by checking if gasLimit == gasUsed in that txHash. If so, increase gasLimit and offer to resubmit
• if it was multisend ether, maybe the reason was not enough eth balance at the time of execution.

There is pending PR #2 which hasn't been tested fully and maybe it could be reused.