Split OrderInfo class into own file
Split Trade class into own file
Split Transaction class into own file
Split TradeTypeHelper class into own file
Split TradeInfoTypeHelper class into own file
Merge commit '7b7baa12c385387f51cd5505c96ec65994374a71'

Conflicts:
	BtceApi/Depth.cs
	BtceApi/TradeHistory.cs
	BtceApi/TradeInfoType.cs
	BtceApi/TradeType.cs