add a .gitignore file to ignore WP core files...
update Vagrantfile:

* remove constants that don't need to be options
* switch to require 'vagrant-dns' plugin
* explicit setting of 'privileged' flag for scripts as well as
  use of 'keep_color' option
update root-install.sh:

* remove unused constants
* redirect all output to a log file except for progress updates, log
  file can be found in /home/vagrant/root-install.log in the VM
* remove calls to 'sudo' - not needed with use of 'privileged'
  vagrant provisioner
* clean up line breaks
update root-install.sh:

* remove unused constants
* add shebang
* redirect all output to a log file except for progress updates, log
  file can be found in /home/vagrant/user-install.log in the VM
* clean up line breaks