event: Add UserRegistered event class.

rhodecode/events.py

@@ -0,0 +1,14 b''
+
+from zope.interface import implementer
+from rhodecode.interfaces import IUserRegistered
+
+
+@implementer(IUserRegistered)
+class UserRegistered(object):
+    """
+    An instance of this class is emitted as an :term:`event` whenever a user
+    account is registered.
+    """
+    def __init__(self, user, session):
+        self.user = user
+        self.session = session

rhodecode/interfaces.py

@@ -0,0 +1,11 b''
+
+from zope.interface import Attribute, Interface
+
+
+class IUserRegistered(Interface):
+    """
+    An event type that is emitted whenever a new user registers a user
+    account.
+    """
+    user = Attribute('The user object.')
+    session = Attribute('The session while processing the register form post.')