fix #1957 - disable version display

This allows the admin to disable the version information about gogs and
go in use in the footer.

modules/middleware/context.go

@@ -245,6 +245,7 @@ func Contexter() macaron.Handler {
 
 		ctx.Data["ShowRegistrationButton"] = setting.Service.ShowRegistrationButton
 		ctx.Data["ShowFooterBranding"] = setting.ShowFooterBranding
+		ctx.Data["ShowFooterVersion"] = setting.ShowFooterVersion
 
 		c.Map(ctx)
 	}