contrib_bots: Expose some information about user profile

- Expose some information about user profile in `RestrictedClient`
class, like `full_name` and `email` of the user.

- Add `client` argument to `triage_message()`, now it's possible to
call bot with another method instead of calling the specified
keyword.

contrib_bots/lib/wikipedia.py

@@ -27,7 +27,7 @@ class WikipediaHandler(object):
             "@wiki".
             '''
 
-    def triage_message(self, message):
+    def triage_message(self, message, client):
         # return True iff we want to (possibly) response to this message
 
         original_content = message['content']