Extract out Connection/Device initialization

Simple extraction out of Connection/Device initialization code inside
Robot.

This yields an interesting boon, however - this is now a valid Cylon
program:

    var Cylon = require('cylon');

    Cylon
      .robot()
      .connection({ name: 'loopback', adaptor: 'loopback' })
      .device({ name: 'ping', driver: 'ping' })
      .on('ready', function(bot) {
        console.log("Bot working!");

        every(1000, function() {
          console.log(bot.ping.ping());
        })
      });

    Cylon.start();

For those that prefer imperative programs with Cylon, this is a nice
syntax addition.
Merge pull request #242 from hybridgroup/add/imperative-connection-and-device

Extract out Connection/Device initialization