suggestion: jsonrpc method to view pending transactions

[ethers]

discussed briefly with Gav earlier: add/expose eth_getPendingTransactions or eth_getPendingTransactionHashes to jsonrpc

[gavofyork]

please try existing methods such as eth.block('pending')

[gavofyork]

bump

fixed now?

[ethers]

not able to verify on 84ecbaf because:

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["pending",true],"id":1}' http://localhost:8080

gives:
{
"jsonrpc": "2.0",
"id": 1,
"error": {
"message": "INVALID_PARAMS: Invalid method parameters (invalid name and/or type) recognised",
"code": -32602
}
}

Maybe fix for #1774 is also needed?

[ethers]

good thanks