New features and bug fixes

- Modifications made to the request package. Planned improvements will be
sending requests on intervals, rate limiter back off support, dynamic tuning
and requests packaged into a request job group.
- Can modify each exchanges individual HTTP client (e.g timeout and
transport settings).
- Bot now uses an exchange config HTTP timeout value.
- Bot now uses a global HTTP timeout (configurable).
- Batched ticker request support for exchanges.
- Ticker and Orderbook fetching now are spanned accross multiple
go routines and regulated by a sync wait group.
- Fixes hack used to load exchanges, now uses a sync wait group.
- Ticker and Orderbook storage and fetching now uses mutex locks.
- New pair function for finding different pairs between two supplied
 pair arrays. This is used for currency pair updates for exchange which
support dynamic updating.
- Shows removal/additions of dynamic updates currencies.

exchanges/lakebtc/lakebtc.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"log"
-	"net/http"
 	"strconv"
 	"strings"
 	"time"
@@ -39,7 +38,6 @@ const (
 // LakeBTC is the overarching type across the LakeBTC package
 type LakeBTC struct {
 	exchange.Base
-	*request.Handler
 }
 
 // SetDefaults sets LakeBTC defaults
@@ -57,8 +55,8 @@ func (l *LakeBTC) SetDefaults() {
 	l.ConfigCurrencyPairFormat.Uppercase = true
 	l.AssetTypes = []string{ticker.Spot}
 	l.SupportsAutoPairUpdating = false
-	l.Handler = new(request.Handler)
-	l.SetRequestHandler(l.Name, lakeBTCAuthRate, lakeBTCUnauth, new(http.Client))
+	l.SupportsRESTTickerBatching = true
+	l.Requester = request.New(l.Name, request.NewRateLimit(time.Second, lakeBTCAuthRate), request.NewRateLimit(time.Second, lakeBTCUnauth), common.NewHTTPClientWithTimeout(exchange.DefaultHTTPTimeout))
 }
 
 // Setup sets exchange configuration profile
@@ -69,6 +67,7 @@ func (l *LakeBTC) Setup(exch config.ExchangeConfig) {
 		l.Enabled = true
 		l.AuthenticatedAPISupport = exch.AuthenticatedAPISupport
 		l.SetAPIKeys(exch.APIKey, exch.APISecret, "", false)
+		l.SetHTTPClientTimeout(exch.HTTPTimeout)
 		l.RESTPollingDelay = exch.RESTPollingDelay
 		l.Verbose = exch.Verbose
 		l.Websocket = exch.Websocket

exchanges/lakebtc/lakebtc_wrapper.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"log"
 	"strconv"
+	"sync"
 
 	"github.com/thrasher-/gocryptotrader/common"
 	"github.com/thrasher-/gocryptotrader/currency/pair"
@@ -13,8 +14,12 @@ import (
 )
 
 // Start starts the LakeBTC go routine
-func (l *LakeBTC) Start() {
-	go l.Run()
+func (l *LakeBTC) Start(wg *sync.WaitGroup) {
+	wg.Add(1)
+	go func() {
+		l.Run()
+		wg.Done()
+	}()
 }
 
 // Run implements the LakeBTC wrapper