add fee to transaction

add fee value to the transaction
the fee will should be reduced from from_acc e.g. balance 100 --> from_acc 99 fee 1
the miner should be able to collect all fees from transactions in the block in addition to the coinbase

[GH-#83] Added fee to transactions

[GH-#83] Small refactoring

[GH-#83] Fees are now added to the coinbase transaction

[GH-#83] Added test

[GH-#83] Fixed test

[GH-#83] Fixed conflicts

[GH-#83] Fixed sum_coinbase_transactions

[GH-#83] Fixed coinbase tx fee

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