Fix issue #5 again. And some other improvements
Fix issue #5 again. And some other improvements

crazycode/vagrant-debian-wheezy-64,xezpeleta/vagrant-debian-jessie-64,Gasol/vagrant-debian-jessie-64,code-kitchen/vagrant-debian-jessie-64,dforsber-p/vagrant-debian-jessie-64,nvtkaszpir/vagrant-box,jstuyts/vagrant-jessie-minimal-amd64-customizable,wummel/vagrant-virtualbox-debian-base,dotzero/vagrant-debian-jessie-64,shtouff/vagrant-debian-jessie-64,ginas/vagrant-debian-wheezy-64,kraksoft/vagrant-box