Created captcha type (this works, but still no image generation)

Resources/config/services.yml

@@ -0,0 +1,8 @@
+
+services:
+    # captcha type
+    captcha.type:
+        class: Gregwar\CaptchaBundle\Type\CaptchaType
+        arguments: [@session]
+        tags:
+            - { name: form.type, alias: captcha }

Resources/views/captcha.html.twig

@@ -0,0 +1,4 @@
+{% block captcha_widget %}
+    [{{ captcha_code }}]<br />
+    {{ form_widget(form) }}
+{% endblock %}