Upgrading docker connect to use tls. #146
Now the status of ui supports error object.
When an error occurs in `azk start/restart` all instances are stopped.
Ask the user to start agent when required, fix #131

Agent's dependent commands will show up a prompt asking if the user want to start the agent.
Adding a continuous integration wercker.yml file
Adding option to get a docker poems from vm. #197 #146
Updating CHANGELOG.md
Adding wercker badge
Merge branch 'up_docker_version' into feature/up_docker_1.3

Conflicts:
	CHANGELOG.md
Merge branch 'feature/up_docker_1.3' into develop
Adding `--open` option in `start/restart`, fixing #172

Open a url in the preferred application

Usage:

```sh
$ azk start -o [system]
```

help description:

```sh
$ azk help start

Usage: $ azk [options] start [options] [system]

Starts an instance of the system(s)

options:

  --verbose, -v, -vv  Sets the level of detail (default: false) - multiples supported
  --reprovision, -R   Force the provisioning actions before starting an instance (default: false)
  --open="", -o       Open a url of system in the preferred application
```
Merge branch 'feature/stop_start_with_error' into develop

Conflicts:
	CHANGELOG.md
Merge branch 'feature/auto_start_agent' into develop
Merge branch 'hotfix/help_vm_201' into develop

Conflicts:
	README.md
Merge branch 'hotfix/suggestion_rails_pid' into develop
Updating `--open` option

Now the `--open` option in command start and restart open the default system.
Adding support to vbox in mounts folders.
Merge branch 'feature/cmd_open' into develop

Conflicts:
	CHANGELOG.md
	src/cmds/start.js
Fixing start agent
Update README.md

Added missing step for MacOS installation