Fix for not setting Gofig global/user dirs

This patch fixes the issue where the Gofig's global (/etc) and user
($HOME) directories were not set, resulting in the default config files
not being loaded.

core/core.go

@@ -1,11 +1,19 @@
 package core
 
 import (
+	"fmt"
+
 	"github.com/akutz/gofig"
+
+	"github.com/emccode/rexray/util"
 )
 
 func init() {
 	initDrivers()
+
+	gofig.SetGlobalConfigPath(util.EtcDirPath())
+	gofig.SetUserConfigPath(fmt.Sprintf("%s/.rexray", util.HomeDir()))
+
 	gofig.Register(globalRegistration())
 	gofig.Register(driverRegistration())
 }