Added support to direct a !doc to user, better failure/not found for !doc, and general messages

I have added the support so you can now do `nick !docs fluent` and Roomie will address the nick that is provided.  I have also modified the `!docs` command to show that Roomie needs either a doc to look for if nothing is provided, `!docs` or `nick !docs` and also provided response for docs that can not be found.

I have also added the ability to enable general messages.  Building on an array, you supply the trigger and what message you would like returned.