Updated Moq and Log4NET to .NET 4.0
Merge pull request #7 from delasteve/update-nuget-packages

Updated Moq and Log4NET to .NET 4.0
created 'mockable' time, test network params use date of /2/2/2012 - we will need to fix that too. fixes #8
Merge pull request #9 from detroitpro/issue8_failing_blockchain_testdifficultytransisitions

fixes failing test.