Add key parameter to URL generation method.

Resources/config/routing/routing.yml

@@ -1,3 +1,3 @@
 gregwar_captcha.generate_captcha:
-    pattern:   %gregwar_captcha.config.url%
-    defaults:  { _controller: GregwarCaptchaBundle:Captcha:generateCaptcha }
+    pattern:        /generate-captcha/{key}
+    defaults:       { _controller: GregwarCaptchaBundle:Captcha:generateCaptcha }

Resources/config/services.yml

@@ -14,8 +14,8 @@ services:
         class: Gregwar\CaptchaBundle\Generator\CaptchaGenerator
         arguments:
             - @session
+            - @router
             - %gregwar_captcha.config.image_folder%
             - %gregwar_captcha.config.web_path%
             - %gregwar_captcha.config.gc_freq%
-            - %gregwar_captcha.config.expiration%
-            - %gregwar_captcha.config.url%
+            - %gregwar_captcha.config.expiration%