coinbase transactions

[harsh-ps-2003]

• [x] issue #173
• [x] follows contribution guide
• [x] code change includes tests

Adds support for Coinbase Transactions (Basic and BIP34) with tests. Also added optimised shift left and right operations as utility methods!

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[harsh-ps-2003]

@b-j-roberts in case of testing using coinbase transactions from main net, I have only taken one latest output instead of many.