bundles.Add(new StyleBundle(
                "~/Content/fa",
                ContentDeliveryNetwork.MaxCdn.FontAwesomeUrl)
                .Include("~/Content/fontawesome/site.css",new CssRewriteUrlTransform()));

 public async Task<ClaimsIdentity> GenerateUserIdentityAsync(ApplicationUser applicationUser)
        {
            // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
            var userIdentity = await CreateIdentityAsync(applicationUser, DefaultAuthenticationTypes.ApplicationCookie);
            // Add custom user claims here
           userIdentity.AddClaim(new Claim("Avatar",applicationUser.Avatar));
            return userIdentity;
        }