0.7.1

• use slf4j facade in all places (was not consistent);
• add getNewStateInit() helper method EmulateTransactionResult;
• add devenv module - archetype for dev environment;
• class ExternalMessageInfo renamed to ExternalMessageInInfo for better readability;
• add List getInMessages() to InMsgDescr;
• add List getOutMessages() to OutMsgDescr;
• add List getCreatorStatsAsList() to BlockCreateStatsExt;
• add List getShardAccountBlocksAsList() to BlockExtra;
• add List getShardFeesCreatedAsList() to ShardFees;
• add List getKeyExtBlkRefAsList() to OldMcBlocksInfo;
• add List getPrevBlocksAsList() to McStateExtraInfo;
• add List getShardAccountsAsList() to ShardAccounts;
• add printAllMessages() to Block;
• add printAllTransactions() to Block;
• add printAllMessages() to Transaction;
• add printTransactionFees() to Transaction;

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• Review #65:
• implemented proof builder, fix hash map building, fix level mask calculation;
• Thanks to https://github.com/glcanvas!