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/virtual_fs.py

@@ -7,7 +7,7 @@ class VirtualFsHandler(object):
     def usage(self):
         return get_help()
 
-    def triage_message(self, message):
+    def triage_message(self, message, client):
         # return True iff we want to (possibly) response to this message
         if message['type'] != 'stream':
             return False
@@ -16,7 +16,7 @@ class VirtualFsHandler(object):
         return original_content.startswith('fs ')
 
     def handle_message(self, message, client, state_handler):
-        assert self.triage_message(message)
+        assert self.triage_message(message, client)
 
         original_content = message['content']
         command = original_content[len('fs '):]