Additional inline Vagrantfile documentation
Create the wsuwp-platform directory later in provisioning

There was a provisioning failure where /var/www/ was not available yet, so the system wasn't able to create /var/www/wsuwp-platform/. By moving this farther in the chain, I think it's taken care of. If not, we can get fancier with the requires.
Modify yum configuration before Salt provisioning

By default, the bootstrap script run by Salt to install itself on the server detects that this is a CentOS machine and then issues a `yum -y update`. This makes every package on the system fair game for an automatic upgrade, including the kernel. Something about the kernel upgrade that I don't understand yet causes the Virtualbox guest additions to disappear, leaving us without a bootable VM unless we destroy it each time.

By excluding the kernel in yum.conf, we're able to speed up the bootstrap process significantly *and* avoid the issues it was causing.

This commit does cause a few other things to happen out of order for some reason. It now takes 2 provisions to get everything actually working. The next work will take care of that.
Explicitly require packages for managed files when needed

If we don't have an explicit requirement, then provisioning may try to process these files before the system is ready for them. Still some work to be done on this issue.
Require www-data user and group in parts of provisioning

Almost have everything sorted now. Still need to tweak some of the requirements around the /var/www/wsuwp-platform directory so that it exists properly.
Specify makedirs when creating /var/www/wsuwp-platform

For some reason, even though /var/www/ already exists, the makedirs directive is required for this to pass during provisioning.
Add timing expectations for various Vagrant actions

I've been timing the destroy -> up process, so best to document as we go
Change state_output to terse for one line messages after provisioning
Merge branch 'master' of github.com:washingtonstateuniversity/WSUWP-Environment