add vagrant docker provider

now able to deploy on docker provider
@haoyuan @dcapwell 
sure :)

----- Original Message -----
From: "Henry Saputra" <notifications@github.com>
To: "amplab/tachyon" <tachyon@noreply.github.com>
Cc: "Huamin Chen" <hchen@redhat.com>
Sent: Thursday, November 13, 2014 2:42:32 PM
Subject: Re: [tachyon] add vagrant docker provider (#528)

> @@ -54,7 +54,7 @@ If you use Spark to launch an EC2 cluster, `Tachyon` will be installed and confi
>  ## Deploy Tachyon Cluster via Vagrant
>  
>  [Vagrant](https://www.vagrantup.com/downloads.html) can spawn Tachyon cluster locally on
> -[VirtualBox](https://www.virtualbox.org/), in the cloud at [AWS EC2 VPC](http://aws.amazon.com/vpc/),
> +[VirtualBox](https://www.virtualbox.org/) or [container](http://en.wikipedia.org/wiki/Docker_(software)) , in the cloud at [AWS EC2 VPC](http://aws.amazon.com/vpc/),

Would like to see the reference to Docker website rather than wikipedia =P

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