Changed libshadow-ruby18 dependency to ruby-shadow gem
Changed phpVirtualBox password to use "rawpassword" value from data bag
Added attribute

* node['virtualbox']['webportal']['enable-apache2-default-site']
Fixed config.php installation directory to use node['virtualbox']['webportal']['installdir']
Fixed existing file detection
Merge pull request #12 from comutt/master

Some improvements request