Implement Logger (#228)

* Added new base logger

* updated example and test configs

* updated exchange helpers restful router & server

* logPath is now passed to the logger to remove dependency on common package

* updated everything besides exchanges to use new logger

* alphapoint to bitmex done

* updated bitmex bitstamp bittrex btcc and also performance changes to logger

* btcmarkets coinbase coinut exmo gateio wrappers updated

* gateio and gemini logger updated

* hitbtc huobi itbit & kraken updated

* All exchanges updatd

* return correct error for disabled websocket

* don't disconnect client on invalid json

* updated router internal logging

* log.Fatal to t.Error for tests

* Changed from fatal to error failure to set maxprocs

* output ANSI codes for everything but windows for now due to lack of windows support

* added error handling to logger and unit tests

* clear wording on print -> log.print

* added benchmark test

* cleaned up import sections

* Updated logger based on PR requests (added default config options on failure/setting errors)

* ah this should fix travici enc config issue

* Load entire config and clear out logging to hopefully fix travisci issue

* wording & test error handling

* fixed formatting issues based on feedback

* fixed formatting issues based on feedback

* changed CheckDir to use mkdirall instead of mkdir and other changes based on feedback

logger/logger_levels.go

@@ -0,0 +1,33 @@
+package logger
+
+import (
+	"log"
+	"strings"
+)
+
+func logLevel() {
+	clearAllLoggers()
+	enabledLevels := strings.Split(Logger.Level, "|")
+
+	for x := range enabledLevels {
+		switch level := enabledLevels[x]; level {
+		case "DEBUG":
+			debugLogger.SetOutput(logOutput)
+			debugLogger.SetFlags(log.Ldate | log.Ltime)
+		case "INFO":
+			infoLogger.SetOutput(logOutput)
+			infoLogger.SetFlags(log.Ldate | log.Ltime)
+		case "WARN":
+			warnLogger.SetOutput(logOutput)
+			warnLogger.SetFlags(log.Ldate | log.Ltime)
+		case "ERROR":
+			errorLogger.SetOutput(logOutput)
+			errorLogger.SetFlags(log.Ldate | log.Ltime)
+		case "FATAL":
+			fatalLogger.SetOutput(logOutput)
+			fatalLogger.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
+		default:
+			continue
+		}
+	}
+}