Add a new bot, BotMaster

BotMaster manages a list of possible repliers (or "sub-bots") to direct
messages and @reply messages. Upon receiving a message, the available
repliers are scanned until one is found that is willing/able to generate
a reply.

Only one replier, AliveDirectMessageReplier, is currently implemented.
It responds "yes" to direct messages ending in "are you alive?".
Add replier for requests to make sandwiches

See http://xkcd.com/149/
Add default replier

Replies randomly from a small list of lame responses. This one gets
called when none of the other repliers have anything interesting to say.
Support 'an' for sandwich reply
Made a better sandwich code
Added Follow Anlp code
Fix the self-follow check in FollowAnlp
Comment FollowAnlp
Modified and cleaned Follow_Anlp code
Added implementation of wisdomReplier and changed the order of BotMaster
Merge branch 'master' of https://github.com/ut-anlp-bot/tshrdlu
adding the stopwords required for WisdomReplier
Added Bigram implementation to Replier
Added Bigram implementation to Bot Master
Stop words added
Stop words added
Added a working copy of WisdomReplier
Merge branch 'master' of github.com:ut-anlp-bot/tshrdlu
Updating conflicts
Changed path of stopWisdomWords