Dump raw transaction on error

[larrysalibra]

Print out the raw hex transaction to help with debugging transactions that fail to send.

For example, the transaction below failed because it was trying to send zero bitcoin with a large fee, but this wasn't obvious to me until I examined the raw transaction.

{
    "error": "Exception: Tx hash missing from blockcypher response: {u'error': u'Error sending transaction: Transaction b4b13a918444a2a9c3dc4aa5db3e800fdc657f0f5f9386caca44de8ab2cbf0cb non standard: dust.'}",
    "traceback": [
        "Traceback (most recent call last):",
        "  File \"/usr/local/lib/python2.7/dist-packages/blockstore/blockstored.py\", line 587, in blockstore_name_update",
        "    tx_only=tx_only, blockchain_broadcaster=broadcaster_client_inst, user_public_key=user_public_key, testset=blockstore_opts['testset'])",
        "  File \"/usr/local/lib/python2.7/dist-packages/blockstore/lib/operations/update.py\", line 177, in broadcast",
        "    response = broadcast_transaction( signed_tx, blockchain_broadcaster )",
        "  File \"/usr/local/lib/python2.7/dist-packages/pybitcoin/transactions/network.py\", line 53, in broadcast_transaction",
        "    return blockcypher.broadcast_transaction(hex_tx, blockchain_client)",
        "  File \"/usr/local/lib/python2.7/dist-packages/pybitcoin/services/blockcypher.py\", line 91, in broadcast_transaction",
        "    raise Exception(err_str)",
        "Exception: Tx hash missing from blockcypher response: {u'error': u'Error sending transaction: Transaction b4b13a918444a2a9c3dc4aa5db3e800fdc657f0f5f9386caca44de8ab2cbf0cb non standard: dust.'}"
    ]
}

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