vagrant usage to provide identical development environment

http://docs.vagrantup.com/v1/docs/getting-started/why.html explains its advantages.

This builds an ubuntu 12.04 precise vm and starts an apache instance at `usergrid.dev` address. [vagrant-hostmaster] plugin is useful for hosts file manipulation.

Installation:
* Install [VirtualBox]
* Configure Host-Only Network
![08-03-2013 11-23-11](https://f.cloud.github.com/assets/158772/235995/0afaba56-87d3-11e2-9cfb-0d3156ebcdfd.gif)
* Install [Vagrant]
* Install [vagrant-hostmaster](https://github.com/mosaicxm/vagrant-hostmaster)
* Open a terminal window, go to project root folder and run command `vagrant up`


[VirtualBox]: https://www.virtualbox.org/
[Vagrant]: http://www.vagrantup.com/
[vagrant-hostmaster]: https://github.com/mosaicxm/vagrant-hostmaster