Added Remember-Token to Authenticate

Renamed Authenticate to Authenticate2 and added remember-me support
Created Authenticate as wrapper for Authenticate2 for backwards
compat.

sessions_test.go

@@ -22,4 +22,30 @@ func TestAuthenticate(t *testing.T) {
 	if api.authToken != "testtoken" {
 		t.Errorf("expected %s, got %s", "testtoken", api.authToken)
 	}
+
+	if (len(api.remToken) > 0) {
+		t.Errorf("no remember token expected, got remember token %s", api.remToken)
+	}
+}
+
+func TestAuthenticate2(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		rw.Write([]byte(`{"context": "test", "data": {"user": {"email": "test@example.com", "username": "testuser", "external-id": "123", "is-confirmed": true}, "session-token": "testtoken", "remember-token": "remember"}}`))
+	}))
+	defer server.Close()
+
+	api := NewTastytradeAPI(server.URL)
+	err := api.Authenticate2("testuser", "testpassword", true)
+
+	if err != nil {
+		t.Errorf("expected nil, got %v", err)
+	}
+
+	if api.authToken != "testtoken" {
+		t.Errorf("expected %s, got %s", "testtoken", api.authToken)
+	}
+
+	if (api.remToken != "remember") {
+		t.Errorf("Expected remember token remember, got remember token %s", api.remToken)
+	}
 }