Add markov chain plugin
accidentally deleted variable declaration
add documentation for markov plugin
update documentation
Merge pull request #6 from ajmadsen/markov-plugin

Markov plugin
added Bundler files. to run Luggy on your own machine (after setting up a Redis instance if you want to test those plugins), type 'bundle install' in the project root first
refactored some plugins. please keep intialization code inside intializers and handle errors to prevent the entire bot from crashing