added override for navbar background image

services/web/app/views/layout/navbar.jade

@@ -3,7 +3,9 @@ nav.navbar.navbar-default
 		.navbar-header
 			button.navbar-toggle(ng-init="navCollapsed = true", ng-click="navCollapsed = !navCollapsed", ng-class="{active: !navCollapsed}")
 				i.fa.fa-bars
-			if nav.title
+			if settings.nav.custom_logo
+				a(href='/', style='background-image:url("#{settings.nav.custom_logo}")').navbar-brand
+			else if (nav.title)
 				a(href='/').navbar-title #{nav.title}
 			else
 				a(href='/').navbar-brand