New modules

I dunno how to remove commits from a pull request, so here again.
New modules:
Welcome module: When user joins, bot welcomes the user.
Flipcoin module: returns a heads or tails result
Rolldice module:  returns a random value between 1-6.
Fire module:  bot says an object is i=on fire, respond with /me uses the firehose
Excuse module: grabs a random excuse from an array
Tellfortune module: tells a fortune

:+1: Tell me what you think.