Moved CoinbaseUtils to Coin/Coinbase/Utils.cs
Started implementing SerializerTests.
Implemented IJobCounter.
Improved JobTests.
Fixed IExtraNonce.Current and SerializeCoinbase()
Improved tests.
Share.cs now can correctly calculate block header hash and header hash big integer!
Renamed ShareManagerTests as ShareTests.cs.
Implemented SerializeHeaderTest().
Fixed SerializeHeader().
Added PreviousBlockHash to Job.cs.
Merge pull request #172 from raistlinthewiz/develop

Block hash is now correctly calculated!