Login function

loginFunction

    // Handle login form submit
    this.logIn = function(e) {
      e.preventDefault();
      $(".error", this.$el).remove();

      options.user.login({
        email: $("input[name='email']", this.$el).val();
        password: $("input[name='password']", this.$el).val();
      })
      .fail(this.loginError.bind(this))
      .done(this.loginSuccess.bind(this));

      return this;
    };