DEV-54 Upgrade support for vagrant and virtualbox

- Upgrade support for vagrant 1.5.1, virtualbox 4.3.8 AND vagrant 1.5.4, virtualbox 4.3.10 
- Pls note that virtualbox has an installation issue which is reported here ( https://www.virtualbox.org/ticket/4140 ). If you $ vagrant up but can not start virtual box, pls find "VBoxUSBMon.inf" & "VBoxDrv.inf" in your installation directory and re-install it, it will fix the issues.