Continued work implementing Vault of Satoshi support.
Started adding support for retrieving orders from Vault of Satoshi.
Removed CancelMarketTrades from standard IExchange interface.
Continued work on parsers for Vault of Satoshi.
Removed GetMyTrades() and GetAllMyTrades() from IExchange as they're not standard anywhere except Cryptsy.
Split IExchange interface into smaller parts, such that each exchange can implement them piece-wise.
Updated URL for Vircurex API.