Remove triggers that are unsuable.

The only way to use them was via the shared service manager. But in ZF3
this manager is only instantiated after construction. Thus this has no
function anymore.

src/ZfcUser/Form/Base.php

@@ -85,8 +85,6 @@ public function __construct($name = null)
         //$csrf = new Element\Csrf('csrf');
         //$csrf->getValidator()->setTimeout($this->getRegistrationOptions()->getUserFormTimeout());
         //$this->add($csrf);
-
-        $this->getEventManager()->trigger('init', $this);
     }
 
     public function init()

src/ZfcUser/Form/ChangeEmail.php

@@ -65,8 +65,6 @@ public function __construct($name, AuthenticationOptionsInterface $options)
                 'type'  => 'submit'
             ),
         ));
-
-        $this->getEventManager()->trigger('init', $this);
     }
 
     /**

src/ZfcUser/Form/ChangePassword.php

@@ -66,8 +66,6 @@ public function __construct($name, AuthenticationOptionsInterface $options)
                 'type'  => 'submit'
             ),
         ));
-
-        $this->getEventManager()->trigger('init', $this);
     }
 
     /**

src/ZfcUser/Form/Login.php

@@ -66,8 +66,6 @@ public function __construct($name, AuthenticationOptionsInterface $options)
         $this->add($submitElement, array(
             'priority' => -100,
         ));
-
-        $this->getEventManager()->trigger('init', $this);
     }
 
     /**

src/ZfcUser/Form/LoginFilter.php

@@ -38,7 +38,5 @@ public function __construct(AuthenticationOptionsInterface $options)
                 array('name' => 'StringTrim'),
             ),
         ));
-
-        $this->getEventManager()->trigger('init', $this);
     }
 }

src/ZfcUser/Form/RegisterFilter.php

@@ -99,8 +99,6 @@ public function __construct($emailValidator, $usernameValidator, RegistrationOpt
                 ),
             ),
         ));
-
-        $this->getEventManager()->trigger('init', $this);
     }
 
     public function getEmailValidator()