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Incorrect tx receipt trie root (#231)

Neither the `transactionsTrie` nor the `receiptsTrie` were being calculated and the resulting `transactionsRoot` and `receiptsRoot` were always identical (EMPTY_TRIE_ROOT) when there were 1 or more transactions in a block.

This PR suggests a fix by:
Creating 2 empty Tries and populating them with tx index (within the block) as the keys and transactions/receipts for their respective values.  The resulting Trie's roots are then copied to `block.header.transactionsTrie` and `block.header.receiptTrie` respectively.

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