Option for reply if a replier isn't able to provide a reply
added a "repl" to talk with the bot directly

This should make it easier to debug the bot, as it lists replies from
every replier separatly. Talk to the bot via

user: message
should now recover by dropping faulty replies
Fixed a null pointer
Add sudo sandwich replier

Replies to requests to make sandwiches as in the XKCD cartoon:
http://xkcd.com/149/

Unfortunately, a user will be unlikely to have the same conversation
with the bot as in the cartoon because the current Akka-based bot picks
among candidate replies randomly.
Merge pull request #15 from Tass/repl

added a "repl" to talk with the bot directly
Merge pull request #17 from njwilson/sudo-sandwich-replier

Add sudo sandwich replier
Merged Simon's solution to improving management of replies that don't come back from some repliers.
Merged Simon's pull request #16.
Fixed conflicts with merge