…faultEars

1. Context Handler - A context handler interface to get the context object and send it to wit,
It has a function with below signature
function getContext(bot, message); - return context object
2.  defaultEars - If wit fails to give any intent then this may help to do some processing over wit,
may be a regex based botkit defaultEars can be used to do regex matching if wit fails
3.  validateIntent - a Validate Intent interface to validate the intent from wit,
it requires to do some validation over it.
function validateIntent(entities) - return true if valid else false
4.  postProcessIntent - a post process intent interface to do some post processing over wit intent
function postProcessIntent(entities) - return entities after post processing