Fixed Vagrantfile and updated all installation documentation

Changes to Vagrantfile
* Changed everything to use Ubuntu 12.04 instead of 12.10
* Changed installation method from building sources into using Ubuntu (PPA) package 
* Changed the AMI image to use when using AWS installation path (the old had been removed from the ami marketplace)

Changes to Documentation:
* Changes to reflect above changes

Changes to website
* Added nginx.conf for redirects
* Update gettingstarted with new installation using PPA