Added new C# wrapper for:
listMarketProfitAndLoss
listCurrentOrders
listClearedOrders
cancelOrders
replaceOrders
updateOrders
Merge pull request #9 from mrtdoulaty/master

I've added the missing C# wrappers (listMarketProfitAndLoss, listCurrentOrders, listClearedOrders, cancelOrders, replaceOrders, updateOrders)