blog.js for the bot

I don't really know about the state and config stuff, so that probably has to be added but I think the other stuff works quite well.
Also, "pleblag" is missing (as in most plugins), will this be just another plugin? If not, this has to be added, too.

package.json probably has to be changed, too, depending on how we want to handle dependencies.
You should add the package.json change for this to the pull request