Update Vagrantfile
Update Vagrantfile

Add VirtualBox support to Vagrantfile.

amos6224/learning-tools,lowescott/learning-tools,devendermishrajio/learning-tools,xebitstudios/learning-tools,xebitstudios/learning-tools,devendermishrajio/learning-tools,devendermishrajio/learning-tools,lowescott/learning-tools,amos6224/learning-tools,xebitstudios/learning-tools,amos6224/learning-tools,lowescott/learning-tools,lowescott/learning-tools