A little bit of cosmetics
Merged functions `run` and `then` into just `then`
New babblers are automatically connected to the default message bus. The connect function now returns a Promise.
Added 'use strict'; on top of all files
Implemented `babble.ask`
Added function listen to babble (not yet working though)
Changed the API for messagers: connect returns a token, and a third function `disconnect(token)` is required
Added function `Block.ask`
Updated history
updated readme
Some code refactoring
Undoubled stringifying messages
Implemented support for babblifying actors
Released version 0.7.0