Memo Service, Security changes and IAL changes.

* Added the Tell command, which enables users to send messages to
offline users for them to receive when they next come online (think /ms
send).
* Fixed some RAW event checks so that they can't be exploited by users
typing their numbers and junk info after them (oops).
* The bot will now only send WHO requests upon successfully joining a
channel, as opposed to immediately after sending the join request.
* Channels are now only removed from the IAL when the server confirmed
the bot has parted the channel.
* Deprecated a setting in the YouTube upload announcer.
* .clearUploads() method is now public in YouTubeChannel.java.
* Bot now checks for /NAMES RAW events and uses the nicks there to send
messages to the users should they have any waiting.
* Removed the "am I banned from this channel I'm trying to join?" RAW
check as it is no longer needed with the new JOIN confirmation method.