Blockchain pull-request #4

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ShilovSetCorp wants to merge 9 commits intohyperskill:masterfrom

ShilovSetCorp:master

Commits on Nov 12, 2018

Stage 1 completed with 3 blocks in a blockchain
ShilovSetCorp
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Commits on Nov 15, 2018

Stage 2 completed with 10 blocks in a blockchain
ShilovSetCorp
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Commits on Nov 16, 2018

Stage 3 completed with 20 miners
ShilovSetCorp
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Commits on Nov 17, 2018

added ArrayList for miners, synchronize miner to block class from blockchain, made Blockchain public static
ShilovSetCorp
committed

Commits on Nov 21, 2018

few refactoring changes
ShilovSetCorp
committed