Implement AssetId  + its wif format
put stealth address in its own namespace
1.0.5.18
prevent colored coin above dust to be spent
Rename TransactionBuilder.Flush to Then
Pretty ToString for colored transaction
1.0.5.20
Merge branch 'master' of https://github.com/NicolasDorier/NBitcoin.git into WorkBranch

Conflicts:
	NBitcoin/Protocol/Node.cs
Merge branch 'master' of https://github.com/NicolasDorier/NBitcoin.git into WorkBranch