Moves gesture towards being more of a framework.

- Removes the gesture.go script and Makefile
- Adds a go-install'able tool for building a 'bot out of a config file
Updated README
Merge pull request #31 from blinsay/bot_generator

Make Gesture more of a framework
Markov generates random chains across all users now
Change Create interface to take that plugin's own config as argument
Update the twitter plugin to use the new 1.1 api + bearer token
Do not barf when a profile description is not available
Use buffered channels to prevent goroutine leaks