Adds new function to interface to retrieve all enabled currency data from exchange

Implements on alphapointhttp.go
Adds new page to UI to handle exchange balances

interfaces.go

@@ -1,5 +1,6 @@
 package main
 
+//IBotExchange : Enforces standard functions for all exchanges supported in gocryptotrader
 type IBotExchange interface {
 	Setup(exch Exchanges)
 	Start()
@@ -8,4 +9,5 @@ type IBotExchange interface {
 	IsEnabled() bool
 	GetTickerPrice(currency string) TickerPrice
 	GetEnabledCurrencies() []string
+	GetExchangeAccountInfo() ExchangeAccountInfo
 }